Finance department. The steps are as follows:

1. First, log in to the invoicing system, click "System Settings" - "VAT Commodity Code",

2. Next, click "Add" water pump on the left , click "Add Product" on the right and fill in the water pump, short code, specification, unit, and unit price, first click "Finish" and then "Assign Code",

3. After the final coding category is selected, You can set the tax rate and click "OK".