Yes... Im pretty sure I did another post on this but here is the highlights.
1. Go to the self reg you want to modify and in the Form under the reg page
2. If the sponsor email is not enabled or showing do both and click edit.
3. Change User interface to dropdown and in the options field add the emails you want. After the email put a | and after the text you want to show.
example
tald@arubanetworks.com | High School 1
t@arubanetworks.com | High School 2
ta@arubanetworks.com | High School 3
tar@arubanetworks.com | High School 4