In the standard Vectorworks installation there is only the Stair tool included in the default workspace. If you edit the workspace you can find 3 additional stair tools. There is the Custom Stair, Simple Stair, and the Curved Stair. It might seem that with the abilites of the standard Stair, you do not need the other tools. However, the other stair tools are really useful. Keep watching for tips and tricks for these other stairs.