Hello, according to your question' How to add catering fee code to VAT invoice', let me answer it for you: Hello, you can add it like this, open the billing software, and on the system settings page, there is the option of commodity code, click in. There is a classification of commodity information on the left. Choose the one you need. I choose the first one here. Then in the upper right corner, select Add, write down the product name and save it. Click the product name just added, and click the manual option above (if it is commonly used, you can choose the automatic option to see it). Find the commodity classification you wrote, select the tax amount you invoiced below, and then confirm. At this time, it is good to jump out and operate successfully. You can choose to get it in the bill. I hope I can help you.