With a dynamic block, I would like to stretch in the X in one visibility state, and have it stretch that same distance in the Y in another visibility state.  For example, a cabinet that has a vertical section in one visibility state with a stretch parameter in the X for the depth.  When changing that depth, the plan section in another visibility state, which has it's depth in the Y direction, will also change.  AND, the other way around as well.  That is to say if you change the plan section in the Y, the vertical section in the X will also change.

I have been looking at chains and lookups, but cannot see that these will work.  Or if so, how.

And help would be greatly appreciated.