Hello there, @shunhe_pl.

I can see how having an option you're looking for in the program would be helpful. The Community recognizes feedback and suggestions from customers like you can help us improve our product and services to our customers' delight. For now, I suggest submitting feedback directly to our product engineers. 

To send feedback, here's how:

1. Go to the Gear icon on your QBSE account.
2. Select Intuit Account.
3. Click Feedback.
4. Enter your thoughts.
5. Click Submit.

For more information on adding a tax rate, I recommend checking these articles:

• Set up and use GST in QuickBooks Online
• How do I set up sales GST rates and use them on forms? (International QBO)

Please come by the Community if you need anything else. I’ll be here to help. Take care and have a great day.