IF I am on the right track, I need to go to another software program like After Effects to have no background behind my subject (and this is called compositing....?)

Is there a setting in TVP10 that makes the white transparent? ( I've been searching forums and the manual but can't locate it - maybe I don't know the right word for it?)
If there is a setting that makes white transparent, then my drawing can be on it's own layer, and my background painting layer will show behind it - yes?
And if the above two things are true, does this effect a work-around for compositing?(or am I in the wrong boat?)

( and not having to spend More $ to get AE would be a very goood thing!

Thank you!
Kathleen