Multi angle characters are G2 characters. You can create them in CTA3 from a template or just by drawing all angles of all body parts separately and importing them one by one (and reusing some of them).
There are templates for Flash and for Serif's Draw Plus (if you're on Windows).
I'm pretty sure you'll find a tutorial on Reallusion's YouTube channel.
You will not get it to work well right out of the box. It's quite complex. Ibis Fernandez has a tool to speed up the hierarchy and naming conventions. Well worth the $40. He has videos that are good as well.
There are a few nasty bugs to sort out. It will take at least a week full time to figure this out to anyone new.You can pretty much ignore most of the documentation of CTA3 as well, because anything not obvious is not in there when it comes to character creation.
Currently importing G2 and G2.5 doesn't work without workarounds and compromises.
In all honesty, it is easier to just animate in Flash for most things. Yes, the workflow for CTA3 is very good once you have your characters, but the time spent creating a G2 character is a very big cost.