How to cut an extrude boss sketch with a surface please

Hi,

Can anybody tell me how can I cut this extruded cylinder with this surfaces with which I made the circular pattern.

I wish to achieve something like on the needle cap has that feature from the syringe, is like a boolean, so if i will cut it will not to be empty inside but will take the shape of the cylinders.

Thanks in advance

SolidworksSurfacing