Cut imported stl

Hello i imported a stl skull but wanted to cut away parts .

How do you do it?
Tried subract but get this error.
Any work arround.

Hi! Sheet body means the mesh is not a closed solid body, it has an opening somewhere. Please repair/make it closed in a mesh editor, then you’ll be able to apply the boolean tools on it.


Thank you.
For the fast answer.
I will check that.

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