I think you need a third class, say clsParameter. The clsSomeFunction
parameters A,B,C would be properties of type clsParameter and
clsSomeFunction would internally hold three instances of the
clsParameter class. clsSover.ChangeVariable would also be of type
clsParameter but would hold a reference/pointer to one of the A,B,C
objects.

Thanks for the lead, adding a third class works great. I was too
fixated on only using the two classes.

If you require more details, post the code you have so far.

The code is quite extensive, but does work, I was just trying to
simplify the code by putting things in classes to avoid repetative
coding (you can download the program at wwww.easy-well.com). Thanks
again for the help ~Michael