Hi,
It's currently not possible to import your own custom head and use other parts of characters.
But you can open a suggestion about that
To do so, you can go on the Help and use "Suggest a Feature..."
Sophie
As posted (separate thread) - Creature Creator does not appear in mandatory drop down of products - so no way to send via this method at present.
Cheers,
Amy
This is just a suggestion and it's based on Maya...if you're using another program, I have no idea if it will work or not. That said, the characters created by Character Generator seem to be a pretty standard, straight forward mesh. In Maya, you could...in theory...go to an orthographic view, select the faces of the head (I'd import the new head and scale it approprately so you know how far down the neck to go), delete them, then bring in your new head. You'll probably want to edge loop the neck opening to keep it's shape (since you removed the head) and and you may need to tweak a vertice or two in order to get the neck of the new head to fit correctly to the mesh of the body (obviously I haven't tried this yet) but it should work.
Good luck!