Trouble passing iteration values between two separate VI's

Hello,
I'm having a bit of trouble passing a while loop iteration value from one vi to another.
I have tried creating a sub-vi of the "B VI" and dropping the icon into the main vi (in picture called "A VI") and just pull the itereation value out this way. So far no luck as an error occurs which causes Labview to crash.
I've spent a lot of time trying to use invoke nodes, globals and VI server references but I haven't gotten them to work either.
In the pictures below "A VI" is the main acquisition application. "B VI" is the motor control application. Each VI will run at the same time but with their own front panel. Anyway, I would like to pass the while loop iteration value (Called "Steps") from the "B VI" to the "A VI" (essentially use this itereation value to keep track of the number of motor rotations.)
So far no luck so any help would be appreciated.
thanks in advance
SS
Attachments:
A VI1.jpg ‏149 KB
B VI1.jpg ‏169 KB

Hi,
sorry for the confusion. I attached less confusing block diagrams...hope that helps .
The only thing that is in B that i'd like to import into A is the "STEPS" iteration value. (its circled in green).
I'm looking to have this iteration value (from B) updated as A's loop runs.
I use the outside while loop instead of hitting the run continuously button....habit i guess
Right now I'm getting stuck on using Vi references....I've modeled examples fromt the forums and i just can't get it to work....its driving me nuts.
thanks again
Attachments:
A.jpg ‏57 KB
B.jpg ‏49 KB

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