Until now, when executing a staging import, users could choose, prior to the import, to delete all existing information in the destination environment.
This option has been deprecated due to its low usage (verified directly with clients and partners) and the high risk it entails, as deletion affects not only the elements already in the import but also their related entities. This could lead to the loss of necessary information or the possibility of some entities becoming disconnected from the rest, making both the import and error resolution extremely complicated due to the lack of a list of affected elements. There will not be a substitution, so the alternative will be to delete the elements manually, either from the UI, API or directly in the database before performing the import.