You can modify the structure of a logical RMSfile with toolkit as follows:
Start toolkit on your database:
c:\> toolkit dbname
Select 1 - Data Files Menu from the Toolkit Development Menu.
Select D2 - Modify File Definition from the Data File Menu.
Enter the logical name of the RMSfile to modify and press STORE<F5> to continue, or CANCEL <F1>-X to leave without modifying the RMSfile.
You can modify a logical RMSfile with the following command:
c:\> lfedit -v lfname
Lfname is the logical name for the RMSfile. Lfedit assumes that the database has toolkit style subdirectories; lfedit gets the RMS definition file from the def subdirectory. Lfedit runs the filedef program to interactively modify the RMSfile definition.