Use this procedure to specify classifications for any classification definition applied to a stair style. 
- Open a tool palette that has a stair tool. 
 
- Right-click a stair tool, and click Stair Styles. 
 
 
- Select the style that you want to change. 
 
- Click the Classifications tab. 
By default, the classification for all classification definitions is Unspecified. If no classification definitions are listed, none are applied to stair styles. 
  
- For each classification definition, select the classification you want to apply to the current stair style. 
 
- Click OK.