[Ataros]

You can select units with ALT-LMB and drawing a rectangle around them and then rightclick and "Save to file". Then you can load it from file as many times as needed. ALT-RMB and draw a rectangle around them to deselect (or CTRL-LMB?)

Often it is easier to open the mission .mis file in Notepad, copy and paste needed text lines several times and change unit number and one of waypoint coordinates a bit.