The Guest Profiler section in Sales and Marketing gives you the possibility to update a Guest Profile Type with a specific Status like VIP, Member, or Do Not Rent.
1. Open the Guest Profile;
2. Go to the Marketing Information section and change the Guest Type to Do Not Rent;
3. Make sure you Save from the bottom of the page.
If you have multiple times the same guest profile, you may want first to clean the data and merge some profiles.