Hi SteveWHC,
Welcome back to the Community. I'll be happy to steer you in the right direction with using Units of Measure in QuickBooks.
I want to make sure you get the right support with this and the best way would be contacting our support team using this link. One of our agents will be happy to share your screen and assist you with restricting the Unit of Measure.
Feel free to keep me posted on how you make out. Otherwise, here's a helpful resource with more info about Unit of Measure:
Enjoy the rest of your week!