Moving ref dim's in Wildfire Assembly

I'm into my second week on ProE Wildfire. Although I've had gret
success locating re-named and re-located menu picks using the key
mapping feature, I along with my co-workers haven't been able to find
how to move a reference dimension in an assembly. In the past these
type of dimensions as well as others could be moved by selecting
Modify>Dimension Cosmetics>Move Dim. The key mapper says that the new
location is Edit>Preferences. When I go to the Edit pull down,
Preferences is grayed out. Another odd thing is that I can't
pre-select the ref. dim.

Does anybody have a solution for me?