Hello again, KT_HM!

Thank you for posting your question with more details about the items you sell and the specifications so you can generate a report that will be the basis for tax calculation.

Since QBO can only do per unit sold, you that's the only thing we can setup. You can have one item per bottle size. Then, it's up to you on how to determine the ABV out of the sold units. 

I would recommend contacting our QBO Support team on this matter so you can try setting up the items while sharing your screen. 

If you have other questions in mind, feel free to go back to this thread.