[Koha] Circulation

Hello All, I am testing out Koha for a small international school in Bogota Colombia, and I was wondering if there is a way to display a list of patrons, say from a whole class in the circulation screen. I tried adding a patron attribute type for the grade level, but that did not seem to allow me to search this way. I have my own copy of Koha setup on a VM presently, so I have easy access to all the files. Thanks. jon