Howdy,
Zeta Phi Beta Sorority, Inc. has several official auxilliaries. The Pearlettes (little girls 4-7), the Amicettes (girls 9-13), the Archonettes (high school girls), and the Amicae. The Amicae, are women who do not meet the requirements for membership into ZPhiB, but believe in the ideals of the sorority, and assist local chapters with activities. For more info check out
http://www.zpb1920.org or consult your local chapter!
Some of the other NPHC orgs have these types of groups too. (I will let the members of those orgs speak about them, because I don't know the details

)
Now, if you are talking about collegiate based groups (like sweetheart organizations) the only organization that has an official group is Iota Phi Theta Fraternity, Inc.(if I'm not mistaken).
ZetaAce
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A
FinerWoman since 1997...