As of now, there's no way to change, add, or delete facial blend shapes of characters.

We've created a basic set of characters in CC3 we want to be able to adjust the facial morph targets to fit the character(s) better, but the only option for this as of now would be to take the character out of CC3 and do it there.

It would be nice to add a pipeline to add the character, with new blend shapes, back to CC3, and keep the blend shapes when exported, so we could use CC3 to change hair/clothes/pose them etc. The skeleton and vertexes should be the same as before, but the morph targets would be changed.