The deputy general manager is an executive position who's primary function is to learn the CEO's duties in case they ever have to fill in for the CEO. That is their primary responsibility, to be an emergency fill-in for the CEO, or the top position in any company. They spend the majority of their time assisting CEOs with what they do so that they may learn the position.
Deputy General Manager Tasks
Source materials and get estimates from various vendors.
Enforce health and safety, corporate, state, and federal regulations.
Support the General Manager, particularly with compliance, scheduling, and reports.