Hi there, sparsell.

Thanks for sharing the screenshot. This helps us better isolate your concern with custom data fields.

Since the necessary fields from the Additional Customization screen were already enabled, the next thing to do is to add the template in the upper-part of the invoice. This is for the custom fields to show. I've attached a screenshot so you can have a better view:

For questions about QuickBooks Desktop, feel free to visit our site and check our help articles: QuickBooks Desktop Help Articles.

I'm always here to help you all the way with QuickBooks concerns. Have a wonderful day ahead!