multiple service, 1 account

Hello, I have a pilates studio, and currently using bookly for bookings. I have a trouble because we have 4 levels (all members can access these), I tried to create 4 services, but our members can only pick 1 based on their payments. So I just put 1 service for all of our levels. it works, but I can't put the name of the class and I can only have 1 staff. how do I solve this? pls help.