@ Lesbentley: I think you've understood the problem. I'm not sure I understands what to do :)

I have the base prop, the mask/gag (shown in the picture link I posted previously). The attachments are thigs that goes in the "attachment tube" of the mask. In the picture it's a little tray. It could be anything, like a brush or similar.

So I make a geometry-less prop (The ParentA prop) and parent it to the mask? 

Thing is, the mask changes origin when it's FIT posed (via a fit-morph) from the original M4 to V4 (since she's not as tall) - so what shold the origin of the geometry-less prop be? the M4 height or the V4 height? That's where my own brain starts to short-circuit.

Sorry if this doesn't make much sense btw.. It's getting late and while I feel pretty coherent, chances are that what I type might not be...

FREEBIES! | My Gallery | My Store | My FB | Tumblr |
You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.