[Koha] Adding members: Area; Inventory

Thanks, Dorian, for the answer re: z39.50 My next question is regarding adding members. There is an option after the address that allows me to select the AREA. Is this fixed to the scripts and not the database? Is there a simple way to fix this for use with our own "area"? Also, is there a way to list all the contents or an inventory of what I already have in the database? Thanks again. God bless. William