system after it has been installed and programmed?
Yes, you can add Dimmers, Switches, Repeaters, and Master Controls at any time. However, they must be within the appropriate distance from other Repeaters: 60 feet for a new Repeater, 30 feet for Dimmers, Switches, and Master Controls (Note: This does not apply to Accessory Dimmers and Accessory Switches) and adding them must not cause the number of devices to exceed the system limits.