1.

Apply a flight of stairs and right click on it to select 'Add to terrain'.
 
 
 
2. Next, you could apply a character standing in front of the stairs.
 
 

3.

Click the 'Mode switch' button to switch to the Director Mode.
 
 
 
4.
Press Up Arrow Key to move the character forward to climb the stair while in
recording mode.
 
 
 
 
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