GGB It depends entirely on which kind you hire. A chef-consultant writes and costs a menu. A brand agency designs an identity. A development principal — which is what GGB is — carries the whole project: the feasibility case, the concept and menu economics, the HACCP-ready kitchen brief, coordination of the licence route, the opening, and the operating controls that keep the numbers honest afterwards. The question to ask any F&B consultant is which of those decisions they will be in the room for.
From F&B Consultant in Dubai — the full reading, with the method behind this answer.