No, that is not possible.1. It is possible to delete lists without remove existing campaign belong to it?
You can not do that, when a subscriber is deleted simultaneously the statistics are also deleted.2. When I Delete Subscribers, the tracking stats also deleted on a campaign, how do I can safely delete subscribers without deleting statistics?
They can, but this will delete their campaigns as well.Does it mean that the customers simply cannot delete their lists or subscribers?
Without lists, there are no campaigns since campaigns target lists.Actually, my aim is to delete the list or subscriber without deleting the campaigns we don't have any issue regarding disk space just want to delete old lists/subscribers