1. If you wish to split a reservation, you can quickly do so by tapping and holding one of the days in a two day plus reservation.

2. Choose the reservation you want to split, say one from the 27th to the 29th. Tap on the cell that corresponds to the 28th, and by holding it move it up and down to another available room.  

3. You can reverse your action by the same method. Re-positioning the "split" part to its original room.

Note: When you click on a room's number. You can choose to change its status as well.