Hi Kevin,
Thanks so much for the reply. I had tried this originally and it did not work. Perhaps it was something to do with duik or perhaps just a bug in my system, After agonising over it I have found the solution so will share it here in case anyone else is having the same issue. Basically I just copied the arm layer (and all the duik bones and controls, and placed them above the body, Then used a check box control to toggle the opacity of the arm layers between 0 and 100 only revealing the layer I want.
Thanks again for the help.
Conner