You can modify the definition of a logical formfile with toolkit as follows:
Start toolkit on your database:
c:\> toolkit dbname
Select 2 - Data Entry Forms Menu from the Toolkit Development Menu.
Select D2 - Modify a Data Entry Form from the Data Entry Forms Menu.
You can modify a logical formfile with the following command:
c:\> formedit -v lfname
Lfname is the logical name for the formfile. Formedit runs the formdef program to interactively modify the formfile definition.