Toon Boom 8.0 animation help

Hello everyone here
I am a newbie to toon boom 8.0 so i have a problem that i have watched some cartoons in which they rotate their heads backwords …
so how can i do that ???
please help me out
thanks in advance

I believe this should go in Studio section. If u put also some details and maybe drawings, it will be easy to understand and answer your question.