The Narrative and Design division of Westworld Mesa Hub is directed by the park Narrative Lee Sizemore. Here is where the first stages of a Host is conceptually thought up. Everything from how the Host will appear to their storyline is created within this division. After Lee has completed his idea of a new narrative, he must bring it too Dr. Robert Ford for approval.
Besides Lee, the only other person who can override narratives and create their own is Dr. Ford.