Koha:BISAC
At the request of publishers, LC has started including these BISAC codes in the MARC 084 field and also converting these codes into their textual equivalents, which are given in the 650 field with the second indicator value set to "7" (Source specified in subfield $2) and "bisacsh" in subfield $2. There are usually one code and one subject string.[1]
To re-label tags in OPAC and intranet
Administration-->MARC bibliographic framework-->MARC structure-->[Choose framework]
650 Subject Added Entry-Topical Term
Edit $2 Basic Constraints: Text for librarian should read: "Source of heading or term ("BISAC", usually)" Advanced constraints Default Value: "BISAC"
Ensure advancedMARCeditor is set to display descriptions of fields and subfields in the MARC editor.
To set BISAC subject headings as classification number
Use 084 07 Other Classification Number when cataloging, and $2 should read "BISAC," as above.
See Also
Tarsala, Cheryl. "BISAC Basics," The Feral Cataloger. Link.