Book someone in from the class's own menu on the calendar.
Needs the Manage bookings permission.
Booking someone onto a class is done from the class, not from the client.
You also need permission to view clients, or there is nobody to search.
The window stays open after each booking, so you can book several people in one go.
Each row shows what the client has left for this class — Unlimited, a count such as 3 left, or None left — and two ways to book:
A client with nothing left for the class cannot be booked with Book. Use Book free, or give them a membership or a pack first.
A class that is full refuses the booking, Book free included. There is no way to book over the class’s capacity.
A one-to-one is booked from the client instead. On the Clients list, open the actions menu on their row and choose Book PT session, which opens a new session already set up for that client.