This script is mentioned in the manual (https://koha-community.org/manual/22.11/en/html/administration.html?highlight=batchrebuildbibliotables#edit-a-marc-subfield), but not documented anywhere else. To see the existing help for the script: misc/batchRebuildBiblioTables.pl -h See query on the mailing list and response with instructions on how to use it: https://lists.katipo.co.nz/pipermail/koha/2022-October/058571.html