Your question seems slightly confusing or possibly a double question. I will take a hopefully useful stab. I assume you are referring to the life support range of a ship/fleet. This range is from any colony/starbase you own (so multiple "centers" of range) regardless of where the construction of the ship or banding of the fleet took place. As far as a fleet goes, the minimum range of any given ship in the fleet would be used for the group just as movement speed is. If you acquire a new colony or construct a new starbase then range is appropriately updated as a "center". Also new construction of a ship with the same life support range would not change this(only mentioned due to your discarding bit). One trick for some odd range extension is having a ship with a constructor module and a survey module then surveying a wormhole and constructing a starbase at the end point. I assume this still works. Haven't tried lately but doubt that will change. If you happen to be referencing combat in any way then I have virtually no grasp on the new combat mechanics of 3. Also if this is nothing of what you mean then I apologize for the slightly long read and my misunderstanding.