Delete part of an object

hello ! I just want to cut an imported object. Parts in red square

11111_LI|240x500

It might collapse if you cut it. Share the .skp file itself.

Use the Solid Tools …

https://help.sketchup.com/en/sketchup/modeling-complex-3d-shapes-solid-tools

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I try but say this 121

Imported objects are always contained in a component, you would have to dig deeper or explode.
Again, it would be easier to find the culprit if you attach the .skp

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