I'm new to CT8.  Just finished creating a talking head character, but want to remove all background so I can place this inside another video project.  "Floating Talking Head" concept.
QUESTION:  How can I remove the white background like a .png? 
Thank you!

I usually mask my characters externally before importing into CT8.  However, if you haven;t done that, during the face fitting process, you can mask your image then. Upon export, export it as a PNG sequence, and the alpha will be maintained.  Otherwise, export as a video but with a background easily chromakeyed in a video editor to create a transparent background.