That also happened at my school. FSU's TKE chapter (that lost it's charter after an "incident"...the guy involved actually ended up on Geraldo, as his story was so bad, it was perfect for "sensationalism TV"!) was local for ages. I can't remember exactly what they were, but eventually the group was brought into Theta Chi. That didn't last long though, as they are back to being local. They also had a "little sister" local group called KTE that was local until around 1992 that went Phi Mu. That also didn't last, as they went local again.

As for sororities, it's like others said, once you are initiated into a PANHELLENIC sorority, you can't join another one, even if you leave your first group. However, you can join a LOCAL at any time whether you leave or not. But it's beside me as to why someone would want to belong to a National AND local at the same time.

Extension, especially with DZ is more complicated that a local group "choosing" a National org. to affiliate with, so it doesn't happen that often. We chose women who exemplify the ideals of our sorority. If a local has half these type of women, and the other half do not meet our criteria, they will NOT automatically go with the other women into a DZ colony.