Make a hole in Photoshop vector shape?

Question

I have a rounded rectangle vector shape. I would like to make a hole in it (B - A).

How can this be done?

Thanks

Answer 1

duplicate question to this one:

Cut/knock one shape out of another shape

in the same layer: in essence, either flatten the vector mask, and do the knockout on a new vector mask, or use a layer mask (because you can't have another vector mask on the same layer)