Formation Editor - F4
This interface will allow you to customize which unit in a group is the leader, and where the other units will stay relative to it. Especially useful for naval formations, as the default settings can put ships on top of each other. Select one of the units in the group then select the bearing type. Relative will move in relation to the lead unit. Fixed bearing will always remain at that position regardless where the lead is in relationship. Click where you would like the station. It will appear with a grey diamond next to it.