I need to be able to create groups in a clear and simple manner from a long user list. (The standard dynamic field options aren't going to work quite well enough.) I'd like to create something similar to what is shown in the attached image. (For what it's worth, I'll have multiple applications for this same setup once it's figured out.)
I have a list of users from a registration form from which to populate the "search" as well as "list" fields as shown in the image.
 
Thanks for the help!!
Justin