Stairs_BuildUpSync

From ZDoom Wiki

32:Stairs_BuildUpSync (tag, speed, height, reset)

tag: Tag of first sector in staircase 
speed: How quickly the first step raises 
height: Height of each step 
reset: Tics until the stairs return to their original heights (0 if never) 

Builds a staircase in sectors marked with the Stairs_Specials. Each step moves at a different speed so that they all reach their destination heights at the same time.