As of Dec. 20, 2016, Mick Mulvaney is President-Elect Trump's choice for Director of the White House Office of Management and Budget. The Management side of the OMB is concisely stated on its website:
OMB oversees agency management of programs and resources to achieve legislative goals and Administration policy. (https://www.whitehouse.gov/omb/management)
Their website has a much longer, but thorough description of the Budget by policy objectives. These objectives range from creating a climate-smart economy, protecting and increasing water supply, crop insurance, preserving and protecting public lands and oceans, revitalizing manufacturing, biomedical research, civil space, agriculture, education, protecting workers, tax reform, health and safety, justice system, immigration, border security, terrorism, Russian aggression, humanitarian needs.... (https://www.whitehouse.gov/omb/budget)