When the Sysop asks for local operation, or when a remote connection is established, the BBS goes to the first card of the Hyper House stack. From there on, the cards in Hyper House determine the structure of BBS operation. By changing these cards, you can change the menus and messages seen by the users, whether and what type of authorization is required to get from one part of the house to another, and when and how message sections are entered.
To rebuild Hyper House, open it as a normal stack (don't select local operation). You can then explore it's current structure, and change it as you like. (See also BBS Internals.)