Sketching a run is the easiest way to create stairs. The boundaries and risers are generated automatically as you sketch the run. When you finish the sketch, a railing is applied automatically. The Run tool limits the design of your stairs to straight runs, straight runs with landings, and spiral staircases. For more control when designing stairs, sketch the run by sketching the boundary and riser lines.
The Line tool
is selected by default. Select a different tool on the Draw panel if desired.

Click start point on left side

Click endpoint on right end
To create stairs with a landing
The Line tool
is selected by default. Select a different tool on the Draw panel if desired.
You can modify a stair footprint that you have sketched using one of the drawing tools.
In the following image, the sketch of the landing was modified using the Start-End-Radius Arc drawing tool

Modifying a run of stairs

Finished sketch with landing modified
Also, you can modify the stairs you sketched by changing their instance properties on the Properties palette. To access the type properties, click
Edit Type on the Properties palette.
For a description of stair properties and their values, see Stair Properties.