Welcome to the Intuit Community, @baffled_in_boston.

The number of tax codes and rates used to track the items depends on which region the business is located. Aside from that, the business type also affects how to set up the sales tax in your account.

If you want to add another rate, the process can easily be done in QBO. Let’s go to the Sales Tax Center to create it.

Here’s how:

1. Go to the Taxes/ VAT menu on the left panel to access the Tax Center.
   
2. From there, click the Add Tax button in the upper right hand.
   
3. In the Add Tax screen, navigate to the Tax rate section to enter a new rate.
   
4. Follow the on-screen instructions on how to set up the tax.
   
5. Once done, tap the Save button.

Check out the How do I set up sales GST/VAT rates and use them on forms article for more details. It also contains videos and steps on how to track sales taxes in QBO.

Please let me know if there's any other way I can be of assistance. I'm here to make sure you're taken care of. Have a great rest of the day.