[Koha] How to link the field

[JIT lib]

Dear frenz hi
I am using koha window version. following is the specifications

Koha version 2.2.4
OS version Microsoft Windows XP [Version 5.1.2600] 
Perl version5.008007
MySQL versionmysql Ver 12.22 Distrib 4.0.26, for Win32 (ia32) 
Apache version
 Since I am handling a film library, we have the documents like video tape contains so many subjects within a single tape. 
So I want to create a new field of time duration in Cataloguing module.
I also want to show this field in Opac.
So anybody plz tell me how to create a new field and how to link it with opac module so that it could be shown during the catalogue search.

Thanx in advance
regards 

Librarian 
Jahangirabad Media Institute 
Barabnki U.P. India
Ph. 05248-243372
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