Is it possible to apply a partial FBM?  ...or to NOT apply a FBM to certain parts of the body? ...or to break up a FBM into part and apply the parts desired?

For example, using the V4 "Bodybuilder" FBM...is there a way to dial in only for the upper torso, or just arms, etc...?  These only show in the BODY actor.  I found reference to s SVDL script to seperate FBM into the actors, but it did not work, as far as I can tell.  No Bodybuilder morphs in the arms, etc.