Step 1: Click the menu item System Settings-VAT Commodity Code to enter the commodity coding interface. Step 2: 1 Select the commodity code category on the left, taking general commodities as an example. Click on the new product on the right. 3 Enter the commodity name in the position corresponding to the name, and optionally fill in the specification, model, unit and unit price. 4 Click Finish first, and then click Assign Code. Step 3: After clicking the code, enter the keywords of the goods in the name box to search, taking the catering service as an example. By searching the conditions, you can find the corresponding commodity classification, whether to use preferential policies √, tax exemption for preferential types, tax rate of 0%, export tax exemption for policies, and click OK to complete the addition of catering service commodity codes. Enter the page of goods and services tax classification and coding. After successful coding, the goods will have their own tax code. Step 4: Enter the invoice filling interface, and double-click to select the commodity code.