Hello Andreas. You can create and save 3 maps. A map can contain any number of rooms as long as there are no impassable thresholds between them. I also had the idea of building ramps, but rejected it. Much too tedious. Another thing about the charging station: The location of the charging station is saved for each map. This means that the charging station has to be positioned at exactly the same place for each map.

That should work, the robot will treat it like another floor. It may also be helpful to lay down ramps for cleaning, if the slope does not exceed 20 degrees, which the robot should be able to do.