Dragging
You can drag shots from the incomming area to the group area and you can drag shots from one position in the group to another.
If you drag holding down the left mouse button, the shot is moved. If you drag holding down the right mouse button, the shot is copied.
You can drag single shots or you can drag multiple selections. When you drop a multiple selection, they appear starting at the slot that the mouse was over when you dropped them.