I have an assembly.  I am mating the parts.  I have set numeric values for the distance in a coincident mate.

I want to be able to change the values based on values that I set in the assembly's equations.

I have assigned some Global Variables in the assembly's equations but I can't figure out how to replace the value that I have in the coincident mate with the global variable.  How is this done?

I am using SW2012.