Hello! I would like to know a method for making the scenery pieces move in and out of the stage to change the enviroment of a specific moment. For example: the scene is in a park, and there is onstage a Park Bench, a small fountain and a Park light. I want that all these move by itself outstage and at the same time enters into the stage a wall, as desk and some other props, to change into an Office. Any Idea about how to accomplish this?