[Koha] Help needed in KOHA 3.0.3

Hello all. I am using KOHA 3.0.3 on my Debian machine. I wanted to modify the search behaviour of the search "Call Number" field. In my case the Call Number is the field "060a" but by default KOHA uses "082a", I guess. So is it possible to change the call number source??? Another thing I wanted to ask is that is it possible to set up a z39.50 server for my library. I mean that we are hosting about 10 libraries and we want our libraries can import the catalogs from one another as similar to z39.50, how can that be possible??? Please Help Thank you. -- Nitesh Rijal BE IT email: rijal.it@gmail.com url: http://niteshrijal.com.np facebook: http://facebook.com/openrijal twitter: http://twitter.com/openrijal +9779841458173