A team job is one booking, for one customer, that takes two or more of your team at the same time. Two cleaners on a deep clean, two movers on a van, two therapists on a couples massage. Open the service under Shop settings, Services and prices, and under Service details choose how many people it needs, from 1 to 6. The price is for the job, not for each person. The choice is only there once two or more of your team take bookings, and a class always has one teacher.
In the diary, Add with that service shows Also with beside Who with, with the next people ticked for you, and you tick or untick whoever is going. Book it and the job sits in every one of their columns, each card saying who else is on it, like +1 with Megan, with the price on the first person's card. Move it, change its service, mark it done or cancel it from any of its cards and the whole job follows. Open it and the Staff row names everyone; its Edit lets you change a person, take someone off (their time goes straight back on sale) or add another, and each change is checked against the diary first and refused by name when it clashes. A booking of one person looks exactly as it always has.
On your booking page a service that needs two people says so on its card, and there is no Who with step for it. The times offered are the minutes when at least that many of your team, counted in First available, are free together, and a day without enough people at work is greyed out. The booking goes to that many of them, picked from those who are free, and the customer's confirmation names everyone. Add another service and the waiting list are not offered on a team service, and a customer moves a team booking by ringing you rather than from their confirmation page.
The confirmation, reminder, moved and cancelled emails say with Sam and Jo, and so does the calendar file. Everyone on the job whose card asks for booking alerts, and who has a login, gets their own, and someone taken off a job hears nothing more about it.
Team jobs need two or more people taking bookings, so they are part of Pro (on Free, one person takes bookings). The FullDiary app has it all from version 1.9.0: People needed on the service, Also with when you add a booking, "+1 with" on the diary's cards, and Who's on it on the booking.