Seperate colors on a contour

How do I get my windows to cut out in this example? Why do I have so many coplaner problems? How can I turn off snap? Thanks in advance for you time! I’m sure the same questions come up over and over from newbies. Sorry, I have searched the best I could.

I forgot to mention I used the couture tool on the roof over arcs. They are about the right shape they just don’t seem to want to paint a different color!

What do you mean with “coplanar problems”?

If you mean the inference system, you can’t.

Which part exactly?

I figured out everything except how to turn off snap. Is that possible ?

Makes since thanks!!!