I've spent the last two days trying to figure out where or how to map facial bones in Character Creater 4 for custom, pre rigged characters. All other bones work fine but I can't animate the faces. Anyone have a clue?

This is why I will not spend another dime on iclone or reallusion because I begged for a simple face bone set up for export for my game engine and nope, nothing. It is a simple thing. They instead invested so much time into morph targets that can not be used in most engines. Just the toy in the box kid toy engines. So untill they add face bone setup for animations I will not buy cc4. 

Check out my new Bible Forums

Tell you the truth, I hate manuals. I usually try forcing my way through figuring stuff out. But this one got me puzzled.
I think the face profile editor and specifically mapping face bones to blend shapes is the most counterintuitive, user unfriendly interface I have seen in RL software.
You got to keep 3 panels open at all times and enable/disable one for each morphs. But it's working for manual mapping except, automation never works as character does not retain blend-shapes when imported.

Anyway here is a manual. There are lots of chapters to go through: https://manual.reallusion.com/Character-Creator-4/Content/ENU/4.0/06-Facial-Profile-Editor/Expression-Modifications-with-Facial-Profile-Editor.htm