Set up automatic railing placement for stair or ramp creation.
You can select the railing type, and for a stair, specify whether to position the railing on the treads or stringers.
Circulation panel
 (Ramp). 
	 
Circulation panel
 (Stair). 
	 
 (Railing). 

 (Place on Stair/Ramp) tool. 
  
(Finish Edit Mode).