Create a railing by sketching the railing path. 
- Click Architecture tab
Circulation panel
Railing drop-down
 (Sketch Path).  
-  If you are not in a view where you can sketch a railing, you are prompted to pick a view. Select a view from the list, and click Open View. 
 
- To set the host for the railing, click Modify | Create Railing Path tab
Tools panel
 (Pick New Host), and place the cursor near the host (for example, a floor or staircase). As you move the cursor, the appropriate hosts highlight. 
 Note: To select a level, click in the drawing area to start drawing the railing. 
  
- Click on the host to select it. 
 
- Optionally, on the Options panel, select Preview to display the railing system geometry along the path as it is sketched. 
 
- Sketch the railing. 
If you are adding a railing to a run of stairs, the railing must be sketched along the inside line of the stair stinger in order for the railing to host and slope correctly. 
  
- Modify instance properties as needed on the Properties palette, or click 
 Edit Type to access and modify type properties.  
- Click 
 (Finish Edit Mode).  
- Change to a 3D view to see the railing.