Room Number to point another database field

Hi to all.
We are not using “Room Number” in “Appointments” screen. I would like to use that space for another field from same table “openemr_postcalendar_events”, we added a new column “azv_authorization”.

Where to look to point that combobox from “room number” to “azv_authorization” ?

@Jose_Jabe for this you have to changes code as per your requirement

I have a working copy of Openem for testing and making changes… til now I coud not get the right php form yet…