diff --git a/app/Services/Production/BendingInfoBuilder.php b/app/Services/Production/BendingInfoBuilder.php
new file mode 100644
index 0000000..d1f7ac3
--- /dev/null
+++ b/app/Services/Production/BendingInfoBuilder.php
@@ -0,0 +1,822 @@
+<?php
+
+namespace App\Services\Production;
+
+use App\Models\Orders\Order;
+use App\Models\Process;
+use Illuminate\Support\Collection;
+
+/**
+ * 수주 → 생산지시 시 절곡 공정용 bending_info JSON 자동 생성
+ *
+ * 입력: Order (rootNodes eager loaded) + processId
+ * 출력: BendingInfoExtended 구조의 array (work_orders.options.bending_info에 저장)
+ *
+ * @see react/src/components/production/WorkOrders/documents/bending/types.ts
+ */
+class BendingInfoBuilder
+{
+    // 표준 원자재 길이 버킷 (5130 레거시 write_form.php 기준)
+    private const GUIDE_RAIL_LENGTHS = [2438, 3000, 3500, 4000, 4300];
+    private const SHUTTER_BOX_LENGTHS = [1219, 2438, 3000, 3500, 4000, 4150];
+
+    /**
+     * 수주의 노드/BOM 데이터로 bending_info JSON 생성
+     */
+    /**
+     * @param  array|null  $nodeIds  특정 노드만 집계 (null이면 전체)
+     */
+    public function build(Order $order, int $processId, ?array $nodeIds = null): ?array
+    {
+        // 1. 절곡 공정인지 확인
+        $process = Process::find($processId);
+        if (! $process || $process->process_name !== '절곡') {
+            return null;
+        }
+
+        // 2. 루트 노드 확인 (nodeIds가 있으면 해당 노드만 필터)
+        $nodes = $order->rootNodes;
+        if ($nodeIds !== null) {
+            $nodes = $nodes->whereIn('id', $nodeIds);
+        }
+        if ($nodes->isEmpty()) {
+            return null;
+        }
+
+        // 3. 첫 번째 루트 노드에서 product_code 파싱
+        $firstNode = $nodes->first();
+        $productCode = $firstNode->options['product_code'] ?? '';
+        if (empty($productCode)) {
+            return null;
+        }
+
+        $productInfo = $this->parseProductCode($productCode);
+        if (empty($productInfo['productCode'])) {
+            return null;
+        }
+
+        // 4. 재질 매핑
+        $materials = $this->getMaterialMapping(
+            $productInfo['productCode'],
+            $productInfo['finishMaterial']
+        );
+
+        // 5. 노드 집계 (치수별 그룹핑 + BOM 카테고리 분류)
+        $aggregated = $this->aggregateNodes($nodes);
+
+        // 6. bending_info 조립
+        return $this->assembleBendingInfo($productInfo, $materials, $aggregated);
+    }
+
+    /**
+     * product_code 파싱
+     * "FG-KSS02-벽면형-SUS" → productCode, guideType, finishMaterial
+     */
+    private function parseProductCode(string $fullCode): array
+    {
+        $parts = explode('-', $fullCode);
+
+        // FG 접두사 제거
+        if (($parts[0] ?? '') === 'FG') {
+            array_shift($parts);
+        }
+
+        $finish = $parts[2] ?? 'EGI';
+
+        return [
+            'productCode' => $parts[0] ?? '',
+            'guideType' => $parts[1] ?? '벽면형',
+            'finishMaterial' => $finish === 'SUS' ? 'SUS마감' : 'EGI마감',
+        ];
+    }
+
+    /**
+     * BOM 아이템 카테고리 분류 (item_code/item_name 패턴 매칭)
+     */
+    private function categorizeBomItem(array $bomItem): ?string
+    {
+        $code = $bomItem['item_code'] ?? '';
+        $name = $bomItem['item_name'] ?? '';
+
+        if (str_starts_with($code, 'BD-가이드레일')) {
+            return 'guideRail';
+        }
+        if (str_starts_with($code, 'BD-케이스')) {
+            return 'shutterBox_case';
+        }
+        if (str_starts_with($code, 'BD-마구리')) {
+            return 'shutterBox_finCover';
+        }
+        if (str_contains($name, '하장바')) {
+            return 'bottomBar';
+        }
+        if ($code === 'EST-SMOKE-레일용') {
+            return 'smokeBarrier_rail';
+        }
+        if ($code === 'EST-SMOKE-케이스용') {
+            return 'smokeBarrier_case';
+        }
+        if (str_starts_with($code, 'BD-L-BAR')) {
+            return 'detail_lbar';
+        }
+        if (str_starts_with($code, 'BD-보강평철')) {
+            return 'detail_reinforce';
+        }
+
+        return null;
+    }
+
+    /**
+     * 노드 집계: 치수별 그룹핑 + BOM 카테고리 분류
+     */
+    private function aggregateNodes(Collection $nodes): array
+    {
+        $dimensionGroups = [];
+        $totalNodeQty = 0;
+        $bomCategories = [];
+
+        foreach ($nodes as $node) {
+            $opts = $node->options ?? [];
+            // 절곡 원자재 길이는 오픈 사이즈 기준 (제조치수는 +offset 포함으로 부적합)
+            $width = (int) ($opts['open_width'] ?? $opts['width'] ?? 0);
+            $height = (int) ($opts['open_height'] ?? $opts['height'] ?? 0);
+            $nodeQty = $node->quantity ?? 1;
+            $totalNodeQty += $nodeQty;
+
+            // 치수별 그룹핑
+            $dimKey = "{$height}_{$width}";
+            if (! isset($dimensionGroups[$dimKey])) {
+                $dimensionGroups[$dimKey] = [
+                    'height' => (int) $height,
+                    'width' => (int) $width,
+                    'qty' => 0,
+                ];
+            }
+            $dimensionGroups[$dimKey]['qty'] += $nodeQty;
+
+            // BOM 아이템 카테고리 분류 (첫 노드에서 메타데이터 추출)
+            $bomItems = $opts['bom_result']['items'] ?? [];
+            foreach ($bomItems as $bom) {
+                $cat = $this->categorizeBomItem($bom);
+                if ($cat && ! isset($bomCategories[$cat])) {
+                    $bomCategories[$cat] = $bom;
+                }
+            }
+        }
+
+        return [
+            'dimensionGroups' => array_values($dimensionGroups),
+            'totalNodeQty' => $totalNodeQty,
+            'bomCategories' => $bomCategories,
+        ];
+    }
+
+    /**
+     * bending_info JSON 조립 (BendingInfoExtended 구조)
+     */
+    private function assembleBendingInfo(array $productInfo, array $materials, array $agg): array
+    {
+        $guideRailBom = $agg['bomCategories']['guideRail'] ?? null;
+        $caseBom = $agg['bomCategories']['shutterBox_case'] ?? null;
+        $finCoverBom = $agg['bomCategories']['shutterBox_finCover'] ?? null;
+        $lbarBom = $agg['bomCategories']['detail_lbar'] ?? null;
+        $dimGroups = $agg['dimensionGroups'];
+
+        // 가이드레일 baseSize 추출: BD-가이드레일-KSS01-SUS-120*70 → "120*70"
+        $baseSize = $guideRailBom ? $this->extractBaseSize($guideRailBom['item_code'] ?? '') : '';
+
+        return [
+            'productCode' => $productInfo['productCode'],
+            'finishMaterial' => $productInfo['finishMaterial'],
+            'common' => $this->buildCommon($productInfo['guideType'], $baseSize, $dimGroups),
+            'detailParts' => $this->buildDetailParts($guideRailBom, $lbarBom, $materials),
+            'guideRail' => $this->buildGuideRail($productInfo['guideType'], $baseSize, $materials, $dimGroups, $productInfo['productCode']),
+            'bottomBar' => $this->buildBottomBar($materials, $dimGroups),
+            'shutterBox' => $this->buildShutterBox($caseBom, $finCoverBom, $baseSize, $dimGroups),
+            'smokeBarrier' => $this->buildSmokeBarrier($dimGroups),
+        ];
+    }
+
+    // ─────────────────────────────────────────────────
+    // common 섹션
+    // ─────────────────────────────────────────────────
+
+    private function buildCommon(string $guideType, string $baseSize, array $dimGroups): array
+    {
+        return [
+            'kind' => $guideType.' '.str_replace('*', 'X', $baseSize),
+            'type' => $guideType.'('.$baseSize.')',
+            'lengthQuantities' => $this->heightLengthQuantities($dimGroups),
+        ];
+    }
+
+    // ─────────────────────────────────────────────────
+    // detailParts 섹션
+    // ─────────────────────────────────────────────────
+
+    private function buildDetailParts(?array $guideRailBom, ?array $lbarBom, array $materials): array
+    {
+        $parts = [];
+
+        if ($guideRailBom) {
+            $baseSize = $this->extractBaseSize($guideRailBom['item_code'] ?? '');
+            $parts[] = [
+                'partName' => '가이드레일',
+                'material' => $materials['guideRailFinish'],
+                'barcyInfo' => $baseSize,
+            ];
+        }
+
+        if ($lbarBom) {
+            // BD-L-BAR-KSS01-17*60 → "17*60"
+            $lbarSize = $this->extractLastSize($lbarBom['item_code'] ?? '');
+            $parts[] = [
+                'partName' => 'L-BAR',
+                'material' => $this->extractFinishFromCode($lbarBom['item_code'] ?? '', $materials),
+                'barcyInfo' => $lbarSize,
+            ];
+        }
+
+        return $parts;
+    }
+
+    // ─────────────────────────────────────────────────
+    // guideRail 섹션
+    // ─────────────────────────────────────────────────
+
+    private function buildGuideRail(string $guideType, string $baseSize, array $materials, array $dimGroups, string $productCode): array
+    {
+        $heightData = $this->heightLengthData($dimGroups);
+
+        // 가이드레일은 개구부 양쪽 2개이므로 수량 ×2
+        foreach ($heightData as &$entry) {
+            $entry['quantity'] *= 2;
+        }
+        unset($entry);
+
+        $baseDims = $this->getBaseDimensions($productCode);
+
+        if ($guideType === '혼합형') {
+            // 혼합형: 벽면+측면 둘 다
+            return [
+                'wall' => [
+                    'baseSize' => $baseSize,
+                    'baseDimension' => $baseDims['wall'],
+                    'lengthData' => $heightData,
+                ],
+                'side' => [
+                    'baseSize' => $baseSize,
+                    'baseDimension' => $baseDims['side'],
+                    'lengthData' => $heightData,
+                ],
+            ];
+        }
+
+        if ($guideType === '측면형') {
+            return [
+                'wall' => null,
+                'side' => [
+                    'baseSize' => $baseSize,
+                    'baseDimension' => $baseDims['side'],
+                    'lengthData' => $heightData,
+                ],
+            ];
+        }
+
+        // 벽면형 (기본)
+        return [
+            'wall' => [
+                'baseSize' => $baseSize,
+                'baseDimension' => $baseDims['wall'],
+                'lengthData' => $heightData,
+            ],
+            'side' => null,
+        ];
+    }
+
+    // ─────────────────────────────────────────────────
+    // bottomBar 섹션
+    // ─────────────────────────────────────────────────
+
+    private function buildBottomBar(array $materials, array $dimGroups): array
+    {
+        $length3000Qty = 0;
+        $length4000Qty = 0;
+
+        // 레거시 Slat_updateCol49to51() 동일 로직: 오픈폭 범위별 3000/4000 조합 배분
+        foreach ($dimGroups as $group) {
+            $width = $group['width'];
+            $qty = $group['qty'];
+
+            [$qty3000, $qty4000] = $this->bottomBarDistribution($width);
+            $length3000Qty += $qty3000 * $qty;
+            $length4000Qty += $qty4000 * $qty;
+        }
+
+        return [
+            'material' => $materials['bottomBarFinish'],
+            'extraFinish' => $materials['bottomBarExtraFinish'],
+            'length3000Qty' => $length3000Qty,
+            'length4000Qty' => $length4000Qty,
+        ];
+    }
+
+    // ─────────────────────────────────────────────────
+    // shutterBox 섹션
+    // ─────────────────────────────────────────────────
+
+    private function buildShutterBox(?array $caseBom, ?array $finCoverBom, string $guideBaseSize, array $dimGroups): array
+    {
+        if (! $caseBom) {
+            return [];
+        }
+
+        // BD-케이스-500*380 → "500*380"
+        $caseSize = str_replace('BD-케이스-', '', $caseBom['item_code'] ?? '');
+        $caseParts = explode('*', $caseSize);
+        $caseWidth = (int) ($caseParts[0] ?? 0);
+        $caseHeight = (int) ($caseParts[1] ?? 0);
+
+        // railWidth: 가이드레일 baseSize에서 첫 번째 숫자 (120*70 → 120)
+        $guideParts = explode('*', $guideBaseSize);
+        $railWidth = (int) ($guideParts[0] ?? 0);
+
+        // 상부덮개 수량: ceil(openWidth / 1219) × nodeQty (레거시 Slat_updateCol45)
+        $coverQty = 0;
+        // 마구리 수량: nodeQty × 2 (레거시 Slat_updateCol46: col15 * 2)
+        $finCoverQty = 0;
+        foreach ($dimGroups as $group) {
+            $coverQty += (int) ceil($group['width'] / 1219) * $group['qty'];
+            $finCoverQty += $group['qty'] * 2;
+        }
+
+        // lengthData: 표준 원자재 조합 배분 (레거시 Slat_updateCol39to43)
+        $widthData = $this->shutterBoxCombinedLengthData($dimGroups);
+
+        return [
+            [
+                'size' => $caseSize,
+                'direction' => '양면',
+                'railWidth' => $railWidth,
+                'frontBottom' => $caseHeight,
+                'coverQty' => $coverQty,
+                'finCoverQty' => $finCoverQty,
+                'lengthData' => $widthData,
+            ],
+        ];
+    }
+
+    /**
+     * dimGroups를 조합 배분하여 셔터박스 lengthData 생성
+     */
+    private function shutterBoxCombinedLengthData(array $dimGroups): array
+    {
+        $combined = [];
+
+        foreach ($dimGroups as $group) {
+            $dist = $this->shutterBoxDistribution($group['width']);
+            foreach ($dist as $length => $count) {
+                if ($count > 0) {
+                    $combined[$length] = ($combined[$length] ?? 0) + $count * $group['qty'];
+                }
+            }
+        }
+
+        $result = [];
+        ksort($combined);
+        foreach ($combined as $length => $qty) {
+            $result[] = ['length' => $length, 'quantity' => $qty];
+        }
+
+        return $result;
+    }
+
+    /**
+     * 오픈폭에 따른 셔터박스 표준 원자재 조합 배분
+     * 레거시 5130/estimate/common/common_addrowJS.php Slat_updateCol39to43() 동일
+     *
+     * @return array<int,int> [1219 => qty, 2438 => qty, 3000 => qty, 3500 => qty, 4000 => qty, 4150 => qty]
+     */
+    private function shutterBoxDistribution(int $openWidth): array
+    {
+        $d = [1219 => 0, 2438 => 0, 3000 => 0, 3500 => 0, 4000 => 0, 4150 => 0];
+
+        // col39 (1219mm)
+        if ($openWidth <= 1219) {
+            $d[1219] = 1;
+        } elseif ($openWidth > 4150 && $openWidth <= 4219) {
+            $d[1219] = 1;
+        } elseif ($openWidth > 4219 && $openWidth <= 4719) {
+            $d[1219] = 1;
+        } elseif ($openWidth > 4876 && $openWidth <= 5219) {
+            $d[1219] = 1;
+        } elseif ($openWidth > 5219 && $openWidth <= 5369) {
+            $d[1219] = 1;
+        } elseif ($openWidth > 9026 && $openWidth <= 9219) {
+            $d[1219] = 1;
+        }
+
+        // col40 (2438mm)
+        if ($openWidth > 1219 && $openWidth <= 2438) {
+            $d[2438] = 1;
+        } elseif ($openWidth > 4719 && $openWidth <= 4876) {
+            $d[2438] = 2;
+        } elseif ($openWidth > 5369 && $openWidth <= 5938) {
+            $d[2438] = 1;
+        } elseif ($openWidth > 6000 && $openWidth <= 6438) {
+            $d[2438] = 1;
+        } elseif ($openWidth > 6500 && $openWidth <= 6588) {
+            $d[2438] = 1;
+        } elseif ($openWidth > 8300 && $openWidth <= 8376) {
+            $d[2438] = 2;
+        } elseif ($openWidth > 8376 && $openWidth <= 8438) {
+            $d[2438] = 1;
+        } elseif ($openWidth > 8438 && $openWidth <= 8876) {
+            $d[2438] = 2;
+        } elseif ($openWidth > 9000 && $openWidth <= 9026) {
+            $d[2438] = 2;
+        } elseif ($openWidth > 9219 && $openWidth <= 9438) {
+            $d[2438] = 1;
+        } elseif ($openWidth > 10150 && $openWidth <= 10738) {
+            $d[2438] = 1;
+        }
+
+        // col41 (3000mm)
+        if ($openWidth > 2438 && $openWidth <= 3000) {
+            $d[3000] = 1;
+        } elseif ($openWidth > 4150 && $openWidth <= 4219) {
+            $d[3000] = 1;
+        } elseif ($openWidth > 5369 && $openWidth <= 5438) {
+            $d[3000] = 1;
+        } elseif ($openWidth > 5938 && $openWidth <= 6000) {
+            $d[3000] = 2;
+        } elseif ($openWidth > 6438 && $openWidth <= 6500) {
+            $d[3000] = 1;
+        } elseif ($openWidth > 7000 && $openWidth <= 7150) {
+            $d[3000] = 1;
+        } elseif ($openWidth > 8376 && $openWidth <= 8438) {
+            $d[3000] = 2;
+        } elseif ($openWidth > 8876 && $openWidth <= 9000) {
+            $d[3000] = 3;
+        } elseif ($openWidth > 9438 && $openWidth <= 10150) {
+            $d[3000] = 2;
+        } elseif ($openWidth > 10738 && $openWidth <= 11000) {
+            $d[3000] = 1;
+        }
+
+        // col42 (3500mm)
+        if ($openWidth > 3000 && $openWidth <= 3500) {
+            $d[3500] = 1;
+        } elseif ($openWidth > 4219 && $openWidth <= 4719) {
+            $d[3500] = 1;
+        } elseif ($openWidth > 5438 && $openWidth <= 5938) {
+            $d[3500] = 1;
+        } elseif ($openWidth > 6438 && $openWidth <= 6500) {
+            $d[3500] = 1;
+        } elseif ($openWidth > 6588 && $openWidth <= 7000) {
+            $d[3500] = 2;
+        } elseif ($openWidth > 7150 && $openWidth <= 7650) {
+            $d[3500] = 1;
+        } elseif ($openWidth > 8300 && $openWidth <= 8376) {
+            $d[3500] = 1;
+        } elseif ($openWidth > 9219 && $openWidth <= 9438) {
+            $d[3500] = 2;
+        } elseif ($openWidth > 9438 && $openWidth <= 9500) {
+            $d[3500] = 1;
+        }
+
+        // col43 (4000mm)
+        if ($openWidth > 3500 && $openWidth <= 4000) {
+            $d[4000] = 1;
+        } elseif ($openWidth > 4876 && $openWidth <= 5219) {
+            $d[4000] = 1;
+        } elseif ($openWidth > 6000 && $openWidth <= 6438) {
+            $d[4000] = 1;
+        } elseif ($openWidth > 7150 && $openWidth <= 7500) {
+            $d[4000] = 1;
+        } elseif ($openWidth > 7650 && $openWidth <= 8000) {
+            $d[4000] = 2;
+        } elseif ($openWidth > 8000 && $openWidth <= 8150) {
+            $d[4000] = 1;
+        } elseif ($openWidth > 8438 && $openWidth <= 8876) {
+            $d[4000] = 1;
+        } elseif ($openWidth > 9026 && $openWidth <= 9219) {
+            $d[4000] = 2;
+        } elseif ($openWidth > 9500 && $openWidth <= 10000) {
+            $d[4000] = 1;
+        } elseif ($openWidth > 10150 && $openWidth <= 10438) {
+            $d[4000] = 2;
+        } elseif ($openWidth > 10738 && $openWidth <= 11000) {
+            $d[4000] = 2;
+        }
+
+        // col44 (4150mm)
+        if ($openWidth > 4000 && $openWidth <= 4150) {
+            $d[4150] = 1;
+        } elseif ($openWidth > 5219 && $openWidth <= 5369) {
+            $d[4150] = 1;
+        } elseif ($openWidth > 6500 && $openWidth <= 6588) {
+            $d[4150] = 1;
+        } elseif ($openWidth > 7000 && $openWidth <= 7150) {
+            $d[4150] = 1;
+        } elseif ($openWidth > 7500 && $openWidth <= 7650) {
+            $d[4150] = 1;
+        } elseif ($openWidth > 8000 && $openWidth <= 8150) {
+            $d[4150] = 1;
+        } elseif ($openWidth > 8150 && $openWidth <= 8300) {
+            $d[4150] = 2;
+        } elseif ($openWidth > 9000 && $openWidth <= 9026) {
+            $d[4150] = 1;
+        } elseif ($openWidth > 10000 && $openWidth <= 10150) {
+            $d[4150] = 1;
+        } elseif ($openWidth > 10438 && $openWidth <= 10738) {
+            $d[4150] = 2;
+        }
+
+        return $d;
+    }
+
+    // ─────────────────────────────────────────────────
+    // smokeBarrier 섹션
+    // ─────────────────────────────────────────────────
+
+    /**
+     * 연기차단재 섹션 (레거시 Slat_updateCol24~29, Slat_updateCol48 동일)
+     *
+     * W50 (레일용): col24 = open_height + 250 → 범위별 표준 길이, qty = 2 × 셔터수
+     * W80 (케이스용): col38 = open_width + 240, col48 = floor(col38*2/3000 + 1) × 셔터수
+     */
+    private function buildSmokeBarrier(array $dimGroups): array
+    {
+        $w50Combined = [];
+        $w80Qty = 0;
+
+        foreach ($dimGroups as $group) {
+            $height = $group['height'];
+            $width = $group['width'];
+            $nodeQty = $group['qty'];
+
+            // W50: col24 = open_height + 250 → 범위별 표준 길이
+            $col24 = $height + 250;
+            $w50Length = null;
+
+            if ($col24 <= 2438) {
+                $w50Length = 2438;
+            } elseif ($col24 <= 3000) {
+                $w50Length = 3000;
+            } elseif ($col24 <= 3500) {
+                $w50Length = 3500;
+            } elseif ($col24 <= 4000) {
+                $w50Length = 4000;
+            } elseif ($col24 <= 4300) {
+                $w50Length = 4300;
+            }
+            // > 4300: W50 없음
+
+            if ($w50Length !== null) {
+                $w50Combined[$w50Length] = ($w50Combined[$w50Length] ?? 0) + 2 * $nodeQty;
+            }
+
+            // W80: col38 = open_width + 240, col48 = floor(col38*2/3000 + 1) × 셔터수
+            $col38 = $width + 240;
+            $w80PerNode = (int) floor(($col38 * 2 / 3000) + 1);
+            $w80Qty += $w80PerNode * $nodeQty;
+        }
+
+        // W50 결과 조립
+        $w50Result = [];
+        ksort($w50Combined);
+        foreach ($w50Combined as $length => $qty) {
+            if ($qty > 0) {
+                $w50Result[] = ['length' => $length, 'quantity' => $qty];
+            }
+        }
+
+        return [
+            'w50' => $w50Result,
+            'w80Qty' => $w80Qty,
+        ];
+    }
+
+    // ─────────────────────────────────────────────────
+    // 재질 매핑 (프론트 getMaterialMapping 동일 로직)
+    // ─────────────────────────────────────────────────
+
+    /**
+     * @see react/src/components/production/WorkOrders/documents/bending/utils.ts:77
+     */
+    private function getMaterialMapping(string $productCode, string $finishMaterial): array
+    {
+        // Group 1: SUS 전용 (KQTS01, KSS01, KSS02)
+        if (in_array($productCode, ['KQTS01', 'KSS01', 'KSS02'])) {
+            return [
+                'guideRailFinish' => 'SUS 1.2T',
+                'bodyMaterial' => 'EGI 1.55T',
+                'guideRailExtraFinish' => '',
+                'bottomBarFinish' => 'SUS 1.5T',
+                'bottomBarExtraFinish' => '없음',
+            ];
+        }
+
+        // Group 2: KTE01 (마감유형 분기)
+        if ($productCode === 'KTE01') {
+            $isSUS = $finishMaterial === 'SUS마감';
+
+            return [
+                'guideRailFinish' => 'EGI 1.55T',
+                'bodyMaterial' => 'EGI 1.55T',
+                'guideRailExtraFinish' => $isSUS ? 'SUS 1.2T' : '',
+                'bottomBarFinish' => 'EGI 1.55T',
+                'bottomBarExtraFinish' => $isSUS ? 'SUS 1.2T' : '없음',
+            ];
+        }
+
+        // Group 3: 기타 (KSE01, KWE01 등)
+        $isSUS = str_contains($finishMaterial, 'SUS');
+
+        return [
+            'guideRailFinish' => 'EGI 1.55T',
+            'bodyMaterial' => 'EGI 1.55T',
+            'guideRailExtraFinish' => $isSUS ? 'SUS 1.2T' : '',
+            'bottomBarFinish' => 'EGI 1.55T',
+            'bottomBarExtraFinish' => $isSUS ? 'SUS 1.2T' : '없음',
+        ];
+    }
+
+    // ─────────────────────────────────────────────────
+    // 유틸리티 메서드
+    // ─────────────────────────────────────────────────
+
+    /**
+     * 가이드레일 item_code에서 baseSize 추출
+     * BD-가이드레일-KSS01-SUS-120*70 → "120*70"
+     */
+    private function extractBaseSize(string $itemCode): string
+    {
+        $parts = explode('-', $itemCode);
+        $last = end($parts);
+
+        // 마지막 세그먼트가 "숫자*숫자" 패턴인지 확인
+        if (preg_match('/^\d+\*\d+$/', $last)) {
+            return $last;
+        }
+
+        return '';
+    }
+
+    /**
+     * item_code 마지막 사이즈 세그먼트 추출
+     * BD-L-BAR-KSS01-17*60 → "17*60"
+     */
+    private function extractLastSize(string $itemCode): string
+    {
+        return $this->extractBaseSize($itemCode);
+    }
+
+    /**
+     * item_code에서 마감재 정보 추출 (L-BAR 등)
+     */
+    private function extractFinishFromCode(string $itemCode, array $materials): string
+    {
+        if (str_contains($itemCode, '-SUS-')) {
+            return 'SUS';
+        }
+        if (str_contains($itemCode, '-EGI-')) {
+            return 'EGI';
+        }
+
+        // BOM 코드에 마감재 표시 없으면 재질 매핑에서 추출
+        return str_contains($materials['guideRailFinish'], 'SUS') ? 'SUS' : 'EGI';
+    }
+
+    /**
+     * height 기준 lengthQuantities (common 섹션용)
+     */
+    private function heightLengthQuantities(array $dimGroups): array
+    {
+        $result = [];
+        $grouped = [];
+
+        foreach ($dimGroups as $group) {
+            $h = $group['height'];
+            $grouped[$h] = ($grouped[$h] ?? 0) + $group['qty'];
+        }
+
+        foreach ($grouped as $length => $qty) {
+            $result[] = ['length' => $length, 'quantity' => $qty];
+        }
+
+        return $result;
+    }
+
+    /**
+     * height 기준 lengthData (guideRail, smokeBarrier 섹션용)
+     * 오픈높이를 표준 원자재 길이로 버킷팅
+     */
+    private function heightLengthData(array $dimGroups): array
+    {
+        return $this->bucketedLengthData($dimGroups, 'height', self::GUIDE_RAIL_LENGTHS);
+    }
+
+    /**
+     * width 기준 lengthData (shutterBox 섹션용)
+     * 오픈폭을 표준 원자재 길이로 버킷팅
+     */
+    private function widthLengthData(array $dimGroups): array
+    {
+        return $this->bucketedLengthData($dimGroups, 'width', self::SHUTTER_BOX_LENGTHS);
+    }
+
+    /**
+     * 치수를 표준 원자재 길이로 버킷팅하여 그룹핑
+     */
+    private function bucketedLengthData(array $dimGroups, string $dimKey, array $buckets): array
+    {
+        $result = [];
+        $grouped = [];
+
+        foreach ($dimGroups as $group) {
+            $raw = (int) $group[$dimKey];
+            $bucketed = $this->bucketToStandardLength($raw, $buckets);
+            $grouped[$bucketed] = ($grouped[$bucketed] ?? 0) + $group['qty'];
+        }
+
+        foreach ($grouped as $length => $qty) {
+            $result[] = ['length' => $length, 'quantity' => $qty];
+        }
+
+        return $result;
+    }
+
+    /**
+     * 오픈폭에 따른 하단마감재(하장바) 3000/4000 수량 배분
+     * 레거시 5130/estimate/common/common_addrowJS.php Slat_updateCol49to51() 동일
+     *
+     * @return array{0: int, 1: int} [3000mm수량, 4000mm수량]
+     */
+    private function bottomBarDistribution(int $openWidth): array
+    {
+        // [3000mm 기본수, 4000mm 기본수]
+        if ($openWidth <= 3000) {
+            return [1, 0];
+        }
+        if ($openWidth <= 4000) {
+            return [0, 1];
+        }
+        if ($openWidth <= 6000) {
+            return [2, 0];
+        }
+        if ($openWidth <= 7000) {
+            return [1, 1];
+        }
+        if ($openWidth <= 8000) {
+            return [0, 2];
+        }
+        if ($openWidth <= 9000) {
+            return [3, 0];
+        }
+        if ($openWidth <= 10000) {
+            return [2, 1];
+        }
+        if ($openWidth <= 11000) {
+            return [1, 2];
+        }
+        if ($openWidth <= 12000) {
+            return [0, 3];
+        }
+
+        // 12000 초과: 4000mm 기준 올림
+        return [0, (int) ceil($openWidth / 4000)];
+    }
+
+    /**
+     * 제품코드별 실제 하부BASE 물리 치수 반환
+     * 대형 프로파일 (KQTS01, KTE01): 벽면 BASE = 135*130
+     * 소형 프로파일 (KSS01, KSS02 등): 벽면 BASE = 135*80
+     * 측면형 BASE는 항상 135*130
+     */
+    private function getBaseDimensions(string $productCode): array
+    {
+        // 레거시: 벽면형 BASE = 135*80 (line 519), 측면형 BASE = 135*130 (line 626)
+        // 제품코드와 무관하게 고정
+        return [
+            'wall' => '135*80',
+            'side' => '135*130',
+        ];
+    }
+
+    /**
+     * 치수를 표준 원자재 길이로 변환 (올림 버킷팅)
+     * dimension 이상인 최소 표준 길이 반환, 초과 시 원본 반환
+     */
+    private function bucketToStandardLength(int $dimension, array $buckets): int
+    {
+        foreach ($buckets as $bucket) {
+            if ($bucket >= $dimension) {
+                return $bucket;
+            }
+        }
+
+        return $dimension;
+    }
+}