Next step includes combine in a group all the layers composing the icon (press Ctrl button and mark out the necessary layers. Holding on the left mouse’s button, move the layers down on Create a new group option).

Make four copies of this group (press the left mouse’s button and move the group down on Create a new layer option). Using the Free Transform selection, it’s possible to place the copies exactly the way it is demonstrated below. On each copy must be changed the sign from Custom Shape Tool (U) with those indicated below, applying the same layer’s parameters: