Simulating one floor in a multi-story building with energyplus

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If you only want to simulate one floor in a building, then use create the geometry for that one floor either in the OpenStudio extension for SketchUp or using floorspaceJS within the OpenStudio Application. Once the floor's geometry is defined, set the Outside Boundary Condition of all floor and ceiling surfaces to "Adiabatic" (assuming that the floors above and below have the same floor plan and thermostat settings). If you render the OpenStudio model's geometry by boundary conditions, then you should see blue applied to exterior surfaces and pink applied to adiabatic surfaces, like in this post.