In Vectorworks all Stories are displayed in the same Window. You have to play with the visibility of Classes and Design Layers to display what you wish to see.
In ARCHICAD you can go up and down Stories in the Floor Plan Viewpoint and only elements set to be visible in the Story will be displayed. So you do not have to play with the Layers to achieve it.
You can create as many Stories as you wish. So you could create a separate Story for the Site Plan and model/draw the Site Plan there.
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