Multiple Bookings Under Parent Booking

I am a wedding photographer and there are several key dates that I need to remember for each couple. I am often asked to do rehersal dinners, engagement sessions, the wedding (of course), and day after photos. These are all usually in different spots.

If there were a way to add multiple appointments with dates times and locations under the one parent booking that would be ideal. That way I dont have to send over two separate client portals for each session. This is especially helpful as we are already able to add multiple galleries to one booking.

Thanks!