From Access Levels create a Floor Group (you can name it Override Floors) that contains the floors (relays) that will follow a Time Schedule. You'll note that when adding floors to a Floor Group, you must assign a Time Schedule to the floor. This Time Schedule association will be the Time Schedule used to unlock the floor.
Add this floor group to an Access Level (doesn't matter which one).
From Hardware Manager, unlock the module and call-up the Elevator Reader's Elevator Definitions window.
From the Elevator Definitions window, set the Override Mode property to the newly created Floor Group with the override floors.