How to fill in the assignment code when issuing the service fee invoice?

Click the menu item System Settings/Basic Coding Settings/User-defined commodity and service coding to open the commodity coding window. In the Commodity Code window, you can add, edit, delete and query commodity code data. Click "Add Commodity" to open the "Add Commodity" window, enter the name, specification, unit and unit price in turn, and click "Submit Now". After adding the goods, click the "Assign Code" button to add a tax code for the goods. Enter product keywords and click the "Search" button. Select the matching commodity code, and click OK to complete the code allocation.