Initial refactoring work

app/Models/InvoiceItemTax.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class InvoiceItemTax extends Model
+{
+	protected $table = 'ab_invoice_item_tax';
+
+	public function invoice_item()
+	{
+		return $this->belongsTo(InvoiceItem::class);
+	}
+}