Need Help!- Calling Subs from Memory Card

[Wheelz]

Can anyone tell me if there's a way to call subs directly from a memory card?

I've used M198 to call from a card in ISO but can't seem to find a way on the Fusion 640M.

Reason:
The memory has a limit for the number of registered programs and to load the 70 odd subs I need to use into memory would mean I'd have to remove a substantial quantity of commonly used programs and also ensure there are no duplicate program numbers.

The simple way to avoid this would be to call directly from a memory card if this is possible.

Any help appreciated.