Thanks for coming back, @dcaroli. That explains why the options we mentioned aren't available because the steps provided were intended for QuickBooks Online. 

After further research, I found out that QuickBooks Enterprise isn’t designed to track sales tax automatically on non-sales transactions. You need to manually track it on bills, checks, and purchase orders.

For more insights, check out this article: Track sales tax on purchases from vendors.

Let me know if you have additional questions. I;ll be here toe help you more.