how would i create/extrude an object within a object?

Hi all, new to solid work. not sure if i put this at the correct subforum. if not, please feel free to move.

i would like to know how would i create some thing like this in solid work.

Thanks,

I understand i could possible do it with the outside part/housing being hollow, however, is there a way for solidwork to minic this without the hollowing the shell?

what feature would i use?

Thanks.

SolidworksSketching