Sash thing???
without a picture its hard to fiture out what you want.
If I'm guessing right, then select the geo then the joint you want to bind it to then do a smooth bind.
Then select the geo and in the componant editior remove the weighting influneces on the joints you dont want, OR just make all the verts have a weighting of 1 on the joint you do want.
"No pressure, no diamonds" Thomas Carlyle