HOW DO YOU CUT OFF CORNERS?

Hello, I'm new to Onshape and currently trying to make a train whistle in CAD so I know what to do when I actually make it. But a problem I've been having is trying to cut these corners off (see black lines (not accurate measurements)).

Is there anyway to cut these corners off? if so could you tell me how?

Thank you for your time!

Screenshot 2025-11-14 10.26.27 AM.png

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