To add a floor, right-click the name of the building in the scenario browser and select Add floor or click the 
button on the control panel.
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A new floor is added to the scenario.
By default, the height of a new floow is equal to 3 meters. If necessary, you can change it. For more information, see Viewing And Editing Floor Properties.
To delete a floor, right-click the name of the building in the scenario browser and then select Delete or click the 
button on the control panel.
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The selected floor is deleted from the scenario.