Hi @Jmcnutt ,
I don't think this is available in Form. The field of form is fixed, can not be changed at will.
All I can think of is to add all a lot of duplicate CARDS up front, and set the duplicate cards to be invisible. Once clicking the button, set the a duplicate card of selected card to be visible. Please see the following test.
1. Set OnStart property :
2. Set visible property of the duplicate Title cards to Var_Title, set the duplicate Hours cards to Var_Hours
3. Set OnSelect property of plus button in Title field:
4. Set OnSelect property of plus button in Hours field: