We have an organic groups based portal in D7 where many blood banks add records. We recently initiated Drupal 8 migration and are close to completion. However, we would want to add selective blood banks first to the new D8 portal, have it tested before we ask all the other blood banks to use the new portal.
Is it possible to set a higher NID value when new records are created by new users? Migration data for remaining customers can happen seamlessly as their NID values will be lower.