An enumerated power the president has is

An enumerated power that the president has is: Nominating and appointing officials

President's enumerated power refers to the power that exclusively belong to the president according to the constitution.

To help the president bring realizations to the cabinet's programs, the presidents have the right to choose various people in officials position that he/she trusted that possess a certain expertise to help the president achieving his/her goals.

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.

yes he did writing dots to make the answer