Seperate Document Import/Export files into Invoice/Bill

app/Imports/Sales/Sheets/InvoiceTotals.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Imports\Sales\Sheets;
+
+use App\Abstracts\Import;
+use App\Http\Requests\Document\DocumentTotal as Request;
+use App\Models\Document\Document;
+use App\Models\Document\DocumentTotal as Model;
+
+class InvoiceTotals extends Import
+{
+    public function model(array $row)
+    {
+        return new Model($row);
+    }
+
+    public function map($row): array
+    {
+        if ($this->isEmpty($row, 'invoice_number')) {
+            return [];
+        }
+
+        $row = parent::map($row);
+
+        $row['document_id'] = (int) Document::invoice()->number($row['invoice_number'])->pluck('id')->first();
+        $row['type'] = Document::INVOICE_TYPE;
+
+        return $row;
+    }
+
+    public function rules(): array
+    {
+        $rules = (new Request())->rules();
+
+        $rules['invoice_number'] = 'required|string';
+
+        unset($rules['invoice_id']);
+
+        return $rules;
+    }
+}