For both copy/paste and copy to Planar EM, if a void’s owner is selected, all of its voids are copied and pasted as voids. Any voids that are not wanted can then be deleted after the paste.
If a void is selected but its owner is not, the void is copied as a primitive. If chosen, the boolean subtract functionality can be used to notch or add a void, based on the overlap between the primitive and another selected primitive.