How did Hürrem Sultan increase the influence of the harem in the Ottoman Empire? She was the harem's chief adviser.
She funded buildings for the harem.
She wrote political letters for the harem.
She moved the harem to the royal palace.

What document are you referring to

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.