How can I cut a custom shape out of a shape?

[Anonymous]

I have the shape shown in the picture and would like to know how I can go about cutting out a custom shape out of the shape I have already.

For example, my idea is I want a star so I would have to cut the star out of the shape first then place it onto the shape so it looks appropriately done

[jeff_strater]

sketch on a plane that is either outside or inside of this shape, then draw your star, then Extrude cut the shape.

I'll post a screencast in a few minutes

[jeff_strater]

here is a screencast:

[Anonymous]

Thank you for your time & help Jeff! Very much appreciated! 

[Anonymous]

Would you know how to round the points of the star?

[jeff_strater]

you can do it in the sketch, or you can just add a fillet to the edge of the cut: