Can I trim or break on a circle?

Hi,
For my work I need to import city plans into bricscad. I only need a small circle of these plans, so i need to delete everything outside the circle. Now I ask my colleague who uses autocad to extrim on a circle and afterwords I use select outside circle to select and delete everything outside the circle, but I need to be able to do this on my own. Is there any way to use a circle to break everything on that cirle or is there any other way to do this?
Thank you.

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