1. Log in to the billing software and click System Settings/Basic Coding Settings/User-defined Goods and Services Coding to open the commodity coding window.

2. In the commodity coding window, you can add, edit, delete, query and a series of editing operations on commodity coding data. Click the "Add Commodity" button, and enter information such as name, simplified code, code, tax code, specification, model, unit price, etc. in the pop-up "Add Commodity" window (choose to fill in according to the actual situation, and leave it blank if there is none), and click the "Submit Now" button.

3. After adding commodities, find the added commodity name, and click the Assign Code button to add tax codes for commodities. Enter commodity keywords, click the search button, select the tax classification code that meets the requirements below the list, and click OK to complete the coding.

4. Click Invoice-select VAT electronic invoice.

5. Fill in the information of the drawer and the name of the goods, pay attention to modify the payee and reviewer, and issue them, upload them and save them.