Unable to trim a mesh using an extrusion - Rhino for Windows

Can't cut nor cap this extrusion - Rhino for Windows - McNeel Forum

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Can't cut nor cap this extrusion - Rhino for Windows - McNeel Forum

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Having trouble trimming. The rectangle is a closed extrusion on top of open polyface. I'm unable to remove exterior bits. I'm extremely new so I've been trying boolean commands, trim/split, and cutting

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Unable to trim a mesh using an extrusion - Rhino for Windows - McNeel Forum