@Lindsey284 Assuming you have three listings - one for the whole place, one for one half, one for the other half. If so, you can change dates and the listing assigned to the reservation by choosing "change reservation" near the bottom of the booking details page.
You are correct, I do have three listings - 1, Yarra 2, Hapinni and 3, Yarrahapinni. So when I go to the change reservation page, I can change the booking to Yarra (one half of the residence), but how do assign the other half of the booking to Hapinni for the different dates?