Thanks for the in-depth response, i'm sure all of it will come in handy eventually. Both objects were vectors, so i selected A and B, used Difference and that did the trick; i had a hole the shape of object A in object B, and object A was gone. Perfect. I was a bit confused though, because using Dif...

The donut hole. In other words, i'd like the shape of object A to become a hole in object B. Thanks for the response!

I would like to apply the selection shape/outline of object A to Object B, so i can cut out a shape from object B of the same size and shape as object A. Is this doable?