diff --git a/database/migrations/2025_09_01_164007_add_subassembly_code_column_to_motor_testing_masters.php b/database/migrations/2025_09_01_164007_add_subassembly_code_column_to_motor_testing_masters.php
new file mode 100644
index 000000000..b7ec7bb0d
--- /dev/null
+++ b/database/migrations/2025_09_01_164007_add_subassembly_code_column_to_motor_testing_masters.php
@@ -0,0 +1,33 @@
+<?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
+    {
+        $sql1 = <<<'SQL'
+
+        ALTER TABLE motor_testing_masters
+        ADD subassembly_code TEXT DEFAULT NULL;
+
+        SQL;
+
+        DB::statement($sql1);
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        // Schema::table('motor_testing_masters', function (Blueprint $table) {
+        //     //
+        // });
+    }
+};