Hey there, @jp415.

Thanks for taking the time to follow along with the thread and share your concerns. 

I have a suggestion that you could try out to complete the import to QBO without sales tax. You could condense your QuickBooks Desktop company file and only bring over 2010 and forward to QuickBooks Online. This way, it will remove the transactions that have sales tax associated with them. However, please remember to back up the company file before condensing the data. Once you condense the data, it is irreversible. 

Here are some steps to condense your data: 

1. Go to File, select Utilities, and then click on Condense Data.
2. Choose the best option for you.
3. Select Next, and the notice Working on your file now will appear. When complete, a window opens advising you of the total reduction in your file size as well as the location of the backup prior to the file optimization.

That should do the trick. For more information about condensing a company file and to ensure this is the right choice for you, check out Use the Condense Data Utility. 

Please let me know if you have any follow-up questions or concerns about this process. I'm always happy to lend a hand. Take care!