If you would like to find out how you can add a guest to an existing booking, please read this article.
If you want to add an accommodation, activity or service to an existing reservation, you have to enter the Booking page of the order (Bookings > Bookings).
1. On the booking page, search for the guest you would like to add the item to. Click on the Add button.
2. A new screen pops up with a list of all your accommodations, activities and services. Click on the inventory item to add this to the existing booking.
3. In the new screen, you can set the quantity for activities and services, or select the check-in and check-out date for accommodations:
4. Don't forget to hit Finish Booking to save your changes.