About Stair by Component

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.

Video: Creating a Custom Stair

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 About Assemblies.
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.