Removing everything above the circle


I have made a shell structure, and I am trying to remove everything above the circle, i.e. making a hole in the middle of the structure. I have tried with “Cull Pattern” without succeeding. Can I get some help?

Please take a look at the attached file + two pictures.

Thank you in advance.

Sicli (23.6 KB)

Picture1 Picture2

Sicli (22.4 KB)

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