Thanks for coming back to us, @Rocky2079.

Currently, we're unable to create an entry on the sales receipt to automatically post to the sales tax expense as a debit. We can't assign an account when creating a sales receipt. You can only change the posting account in the items.

You can visit this link for more information about creating sales receipts in QBDT: Create sales receipts.

Feel free to leave a comment below if you have other questions. I'm more than happy to help.