Since the fall of 2023, there is a plugin available that automatically deletes Libris holdings when one deletes the copy records in Koha.
Plugin: https://github.com/Kreablo/koha-plugin-libris-delete-holding
The development has been funded by Alingsås Library, Bibliotek Mellansjö, Bibliotek i Västmanland, and Katrineholm Library.
Image: CC 2.0 Cari McGee www.carimcgee.com