Combine separate armatures On the right side under scene I have a couple different armatures like
armature.001 and armature.002 and bone. I was wondering how I make these all one object
I'm trying to parent bone 4 to the neck bone but it wont work. I'm guessing because of these separate armatures.
All you have to do is select one armature, shift select the other one, and then press Ctrl+J to join them.

Then shift select the two meshes that go with the armatures, and join them too.  

Then all you have to do is select the mesh, shift select the armature, and press Ctrl+P. Then select the armature deform option.