>>When you run a program that will use these classes, SET PROCEDURE to each of them.
>>As long as it's in memory, it will find it.
>>Be careful not to have identically named classes in each prg, otherwise it will just use the first one if finds.
>
>So the answer is a third .PRG? I'll give that a try, thanks.

Well, that's not the answer really. The answer is the SET PROCEDURE TO to bring these prg's into memory, just like you would to be able to access a function within a prg.

You would most likely SET PROCEDURE to the subclass's prg file, so just set to both while you're at it.

You could also include both definitions in the same prg - no harm in that.