How do I generate one invoice for multiple appointments?

To generate one invoice for multiple appointments in Bookem, simply go to the first appointment that you want to invoice in your calendar - open the appointment and select "new invoice"

This will open a new invoice for that particular appointment. To add additional appointments to this same invoice, select +Add booking and pick the next appointment you want to add to the invoice. You can add as many bookings to one invoice as you like.