Need script for detach element of mesh skined and preserved the skinning

Hi
I have mesh complex skinned but i want detach a element of this mesh using "detach" but the mesh detached lose the skin modifier and not can use ( example detach an arm of a body for put it in another model), I want preserve the skinning for this mesh

How can detach a mesh preserving the skinning in 3ds max 2011?

Excuse my poor english, only speak spanish