By default, online bookings allow a single guest to book services online for themselves. However, you have the ability to allow a guest to book for themselves and others in a single online booking.
From the dashboard, click on 'My Business' and then on 'Online Bookings':
Scroll to the section titled 'Allow Group Bookings' and enable it. You can also configure the maximum group size per booking (including the primary guest):
Once enabled, guests will now have the option to book for themselves or for themselves and others when making an online booking.
Each guest's booking will appear in the SalonBridge calendar as a regular online booking. Staff will be notified of the online booking as per normal, and each guest will receive a booking confirmation and a reminder message (if enabled) of their specific appointment.