You can, but if you assign both remote control buttons to the entrance door, then if you assign the right button to the garage door, then both the door and the garage will operate at the same time (if both are within range of the remote control).
PS. You will have to find out how to add the remote control to the garage in the drive's manual - garage door operators usually have a radio integrated into the control unit and when adding the remote control, the control unit buttons are used.
