I can't split my mesh or armature

As recommended, I moved the sections of my mesh to different layers.

How do I divide the armature into sections and similarly place them in different layers?

Selecting only the bones I wish to move (right arm for example) and pressing ‘P’ (create a separate object) as per the documentation, does nothing. Pressing MKEY while the armature section is selected only brings up the Mirror menu, not the Move To Layer menu.

Bob

I’m not 100% sure but, take the armature into edit mode, select the bones you want to move to a layer, and press M.
The only other way that I can think of is to make several armatures (each one in a different layer) then link them together.