Create a stair by assembling common run, landing, and support components.
To create a component-based stair, you work in a stair assembly edit mode to add common and custom sketched components. In stair assembly edit mode, you can directly assemble components in a plan or 3D view. Tiling the views can give you a complete picture of the stair model as you assemble it. A component-based stair can consist of
- Runs: straight, spiral, U-shaped, L-shaped, custom sketched run
- Landings: created automatically between runs or by picking 2 runs, or by creating a custom sketched landing
- Supports (side and center): created automatically with the runs or by picking a run or landing edge
- Railings: automatically generated during creation or placed later
Note: A stair created by components cannot be added to an assembly. Use the Stair by Sketch method to build a stair that will be included in an assembly. See Assemblies Overview.
Notice in the following image that you can create a stair where the assembled components overlap: 
You can assemble multiple runs leading to the same landing, for example, a T-shaped stair: 
Components in a stair assembly are independent, but also have an intelligent relationship to each other to support design intent. For example, if steps are removed from one run, steps are added to connected runs to maintain the overall stair height.
Because the stair is built with components, the individual parts can be controlled separately; they can be
- scheduled (See Creating a Schedule or Quantity.)
- tagged (See Tagging Stair Components.)
- added, removed or replaced with different parts
- converted to sketch for custom editing
- customized for visual representation