Family Potential Grouping

I have a device family that I am trying to connect a terminal potential on one child symbol to a terminal potential on another child symbol.  I name the potential group in the family the same, and they still don't retain the same wire number.

1) is there a syntax issue that we need to follow to make this work?

2) if i do this to just one set of connection points in the family, do all the other grouping fields need to be entered (uniquely)?