Dear, (1) Click to enter the invoice filling interface, and double-click the name of the goods or taxable services, or click System Settings-Basic Code Settings-User-defined goods and service codes on the home page of tax UKey; (2) Select a commodity code category. You can select an existing category in the folder, or click "Add" to add a new subcategory, and then click "Add Commodity"; (3) After entering the name in the new product input box, the system will automatically generate a simplified code, continue to fill in information such as specifications, models, units and unit prices, and then click Submit Now; (4) Click the coding button on the right side of the goods to be coded, and select the accurate coding in the interface of goods and services tax classification coding or select the goods to be coded through query and search. According to the actual situation, choose whether to fill in preferential policies, preferential policy types, tax rates, tax-included signs and other information. , click OK to realize coding.