How can I join a roofing in a SketchUp easily

How can I join a roofing in a SketchUp easily

This way

hi.

First, please fill in your profile correctly.

The only full info is that you’re using sketchup for school, meaning you’re a kid in school.
The rest is super vague, you’re using the fvll version, on dos ? …

Your profile will orient you to different solutions, manual ones, extensions. depends.

Second, could you explain a bit more what you’re trying to do ? share a photo or a file, expand a bit.

thanks.