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You can group bookings together by going to Bookings -> Click one of the Booking no you want to group -> Click Edit up in the right corner of the page Next to This booking is not grouped -> Search and select the bookings you would like to group this booking with -> Save.

After bookings have been grouped together they will be more noticeably belong together in the calendar view and you will be able to create an invoice for all the bookings in one go.