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In my background, most systems have their population living in O'Neil Cylinders, as these are easier to establish and maintain than trying to build a colony on an alien world. There is no terraforming technology. It would be easiest to build these in the asteroid belts, where most of the construction material would be coming from. Some might be moved to different orbits after construction, depending on intended use. Is there a way to add a megastructure to an existing asteroid belt without having to manually duplicate all the orbital data?