The Copy Selection To Clipboard command it is very effective for copying sections of a board (as many layers as needed) and pasting to a relative distance from the copy location within the same design. When used with the Selection Filter, it has the benefit of copying multiple items from multiple layers, and copying them to relative locations on the same layer numbers in the same design or a new design. Edit|Copy puts every copied item on each destination layer, so copying from several layers at a time puts everything onto one layer.