how to select atoms in ZSM-5 supercell in Circular shape ?

Hi,

Can someone help me in selecting and removing atoms in ZSM-5 supercell in Circular shape.

To make my question more clear I am attaching a journal article(second page, simulation details [subtopic]), where they removed atoms in ZSM-5 supercell in Material studio.

I tried my best to select atoms in ZSM-5 framework but I could make only square or rectangular selection and deletion of atoms.

Please help me.

Thanks in advance

Regards,

--srikanth bojja