If you use authority control in Koha you can set the system up to automatically update all bibs that link to that authority when you make changes to it. See Administration > System Preferences > Authorities > dontmerge for more information.
There is also an item edit tool in Koha that allows items/holdings to be edited in batch. There is currently not a tool within Koha to batch modify bibliographic records. All things going well, Bug 11395 will be included in version 3.20.
Posted in: Cataloging