O.C.G.A. § 50-5-59

It shall be the duty of all departments, institutions, or agencies of the state government to furnish to the Department of Administrative Services when requested and on blanks to be approved by it tabulated estimates of all supplies, materials, and equipment needed and required by the department, institution, or agency for such periods in advance as may be directed by the Department of Administrative Services; and it shall further be the duty of all departments, institutions, or agencies to furnish the Department of Administrative Services inventories from time to time of supplies, materials, or equipment on hand when requested by the Department of Administrative Services.