Sometimes you create a campus preplan with a handful of structures, and later realize you want to split the structures into their own stand-alone preplans.
Or maybe you created a single structure and want to combine it under a campus preplan?
Well, you can now choose to move the structure to a selected preplan, or simply break it out into it's own preplan.
First, be sure Edit Mode is ON
Then navigate to the bottom of the Structure preplan.
And finally, choose an existing preplan or to create a new preplan.