On the File Definition form of the Database Definition tool, press Define (F6) and choose Subtypes.
The Subtype Definition form appears.
If the file has subtypes, press Insert (F8) or select a blank line to add a new subtype.
To change a subtype, select the subtype and press Define (F6).
The cursor moves to the File Records subform. (If a file has no subtypes, the File Records subform appears when you access the Subtype Definition form.)
Type a condition. For more information, see Defining Conditions. The condition is now a subtype for the file.