Enable barcode/accession number search in OPAC

Add following query in
Koha> Administration › System preferences › OPACUserJS

$("select[name='idx']").append("<option value='bc'>Accession No.</option>");

Save.
Refresh OPAC page and see the change.

Information courtesy:
L2C2 Technologies
http://blog.l2c2.co.in/index.php/2016/09/10/quick-tip-add-barcode-lookup-to-your-opacs-search-index-selection-downdown/

Customise Bibliographic framework

Default cataloguing data entry sheet appears with all MARC-21 fields. This not convenient for fast cataloguing.

How to disable unwanted fields and retain commonly used MARC-21 fields.

Go Administration > MARC Bibliographic Framework

 Click on the Import button against Books, Booklets, Workbooks

Download a model framework from here and save it in your system.

Upload the sample framework. Click on the Import button.

Now check your customised Cataloguing data sheet.

Selected fields have arranged in single tab. You can enable or disable more fields again by visiting
Administration > MARC Bibliographic Framework