You can insert a staircase or ramp with a single mouse click. If you place the staircase near a wall, the staircase will automatically snap to the wall. Once you have inserted a staircase, you can edit its size, style and geometry.
To insert a staircase or ramp:
In the building locations drop box, select the location where you want to insert the base of the staircase.
Select Insert
> Stairs/Ramps, or click the Stairs/Ramps button on the Building
toolbar.
In the catalog, select the staircase or ramp you want to insert.
Position the staircase and click to insert it.
Right-click and select Finish.