How would I make a miter cut?

How do I make a 45° miter joint on 3/4” material? Not a picture-frame type just two small joints coming together. Something like a locking miter joint, but without the locking just a simple 45° miter. I’d think this is very basic. I’ve attached the SketchUp file.

how to add a 45 mitre to edges.skp (69.4 KB)

A screenshot, model or some more words would help to explain us better what you are looking for.

Do you mean a miter cut?

Sorry, couldn’t resist.

The car is a Morris Minor.

you’re so funny

Click in sequence on the Scenes Tabs of this SU file for ideas.

How to add a 45 mitre to edges - JL - 2025-09-08.skp (81.2 KB)

Much appreciated thank you