You can choose from a multitude of preset staircase layouts and edit the dimensions of individual segments to suit your needs.
To edit a staircase layout:
Select the staircase whose stair properties you want to edit.
Right-click and select Properties, or select Edit > Modify Elements > Properties.
In the Stairs/Ramps dialog, select the Layout tab.
To change the layout of the staircase, make a selection from the Preset Layouts drop box, or click the graphic to display the available layouts and select the one you want.
To edit the dimensions of a particular segment, select the segment in the Layout Segments window. For example, an L-shaped staircase will have three segments: Stair 1, Landing 2 and Stair 3. The Stair 1 segment is the lower flight of stairs, Landing 2 is the central landing between the two flights, and Stair 3 is the upper flight of stairs.
Different layouts will have different parameters. Clicking a dimension marked with an alphabetical character (a, b, c, etc.) highlights the corresponding dimension in the stair graphic, and vice versa.
To add a flight or landing to your staircase, click Add in the Layout Segments area. Select the segment you want to add in the Add/Edit Segment dialog.
The segment is added to your list of segments in the Layout Segments window. Proceed with defining the parameters for the new segment in the Parameters window.
To change an existing segment to another type, select the segment in the Layout Segments window, then click Edit. Select the new segment type in the Add/Edit Segment dialog.
To delete a segment from the staircase, select the segment in the Layout Segments window, then click Delete.
Once you are satisfied with your layout settings, click OK.