No worries. When you switch to Disney+ at Telenet, your profiles, watch history and preferences simply move with you. You also keep your login and password. All you have to do is order and activate Disney+ via My Telenet. Your account at Disney+ is automatically paused.
Important: If you already have a Disney+ account directly with Disney and you choose a lower-tier plan with Telenet, you must cancel that plan yourself with Disney+. This will help you avoid being charged twice.