[Koha] Custom call-number schemes

Hi, We're a very specialized library dealing with a very narrow range of subjects, so we've created our own classification/call-number system. I'd just like to make sure we're doing it right: We've created something like CALLNUM as an authorized values category, and then we're putting our general call number heading (e.g. BC1100) as the Authorized Value, and then "Reference--Dictionaries" as the Description and the Description (OPAC). And then we've mapped CALLNUM as a mandatory field on our Marc framework. Does it sound like we're doing this the right way? Thanks, Peter Aronson DGL Library, India