add reorderable and clonable line items

app/Concerns/ManagesLineItems.php

 {
     protected function handleLineItems(Model $record, Collection $lineItems): void
     {
-        foreach ($lineItems as $itemData) {
+        foreach ($lineItems as $index => $itemData) {
             $lineItem = isset($itemData['id'])
                 ? $record->lineItems->find($itemData['id'])
                 : $record->lineItems()->make();
                 'description' => $itemData['description'],
                 'quantity' => $itemData['quantity'],
                 'unit_price' => $itemData['unit_price'],
+                'line_number' => $index + 1,
             ]);
 
             if (! $lineItem->exists) {

app/Filament/Company/Resources/Sales/InvoiceResource.php

                             ->saveRelationshipsUsing(null)
                             ->dehydrated(true)
                             ->reorderable()
+                            ->orderColumn('line_number')
                             ->reorderAtStart()
                             ->cloneable()
                             ->addActionLabel('Add an item')

app/Filament/Forms/Components/CustomTableRepeater.php

 
     protected bool | Closure $reorderAtStart = false;
 
+    /**
+     * @var array<string> | Closure | null
+     */
+    protected array | Closure | null $excludedAttributesForCloning = [
+        'id',
+        'line_number',
+        'created_by',
+        'updated_by',
+        'created_at',
+        'updated_at',
+    ];
+
     public function spreadsheet(bool | Closure $condition = true): static
     {
         $this->spreadsheet = $condition;
         return $this->evaluate($this->reorderAtStart) && $this->isReorderable();
     }
 
+    /**
+     * @param  array<string> | Closure | null  $attributes
+     */
+    public function excludeAttributesForCloning(array | Closure | null $attributes): static
+    {
+        $this->excludedAttributesForCloning = $attributes;
+
+        return $this;
+    }
+
+    /**
+     * @return array<string> | null
+     */
+    public function getExcludedAttributesForCloning(): ?array
+    {
+        return $this->evaluate($this->excludedAttributesForCloning);
+    }
+
     protected function setUp(): void
     {
         parent::setUp();
 
             return $action;
         });
+
+        $this->cloneAction(function (Action $action) {
+            return $action
+                ->action(function (array $arguments, CustomTableRepeater $component): void {
+                    $newUuid = $component->generateUuid();
+                    $items = $component->getState();
+
+                    $clone = $items[$arguments['item']];
+
+                    foreach ($component->getExcludedAttributesForCloning() as $attribute) {
+                        unset($clone[$attribute]);
+                    }
+
+                    if ($newUuid) {
+                        $items[$newUuid] = $clone;
+                    } else {
+                        $items[] = $clone;
+                    }
+
+                    $component->state($items);
+                    $component->collapsed(false, shouldMakeComponentCollapsible: false);
+                    $component->callAfterStateUpdated();
+                });
+        });
     }
 
     public function getView(): string

app/Models/Accounting/Document.php

 
     public function lineItems(): MorphMany
     {
-        return $this->morphMany(DocumentLineItem::class, 'documentable');
+        return $this->morphMany(DocumentLineItem::class, 'documentable')->orderBy('line_number');
     }
 
     public function hasLineItems(): bool

app/Models/Accounting/DocumentLineItem.php

         'unit_price',
         'tax_total',
         'discount_total',
+        'line_number',
         'created_by',
         'updated_by',
     ];

database/migrations/2025_05_05_211551_add_sort_order_to_document_line_items.php

+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('document_line_items', function (Blueprint $table) {
+            $table->integer('line_number')->nullable()->after('documentable_id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('document_line_items', function (Blueprint $table) {
+            $table->dropColumn('line_number');
+        });
+    }
+};