is there a way to massively delete custom records that are related to other custom fields in entities? I.E. my vendor is related to one of the custom records i need to delete. Is it possible to remove the custom record, without having to go vendor by vendor and remove this relationship first?

to break the relationship, I'd create a saved search that filters by that relationship, then write a debugger script leveraging that SS to break that relationship and save or record.submitFields as applicable