I was just curious about this.
I am an alumna of Backwater Redneck U.

and the BGLO's on our campus were all part of a "citywide" chapter, as were several other small schools in the area. At one point, Delta Sigma Theta joined the college NPC. What I wondered is, do the members at each school make the decision whether or not to become part of a governing body individually or does the whole "citywide" chapter decide to do the same thing on their respective campuses? This is operating on the assumption that there is no college NPHC.
I hope that made sense!