You do know that the neck, if it was done the same as me, is only half of the body neck and half of the head neck modeld together. So that means the morphs are not going to work on the neck. The verts are different.

Your steps sound right. So you have the single group morphs working.

Your problem is that the BODY does not contain morphs I contains the Channels for the morph. You need to copy those and your PBM will work. BTW, you don't want to copy the Offset/scale/rot/trans/transb channels or delete the ones on your new figure first before copying all channels.

You should be good to go then.