At the request of the Secretary, the Director of the Office of Personnel Management shall, under
section 5108 of title 5, provide for the establishment in each of the grade levels GS–16, GS–17, and GS–18 of a number of positions in the Department equal to the number of positions in that grade level which were used primarily for the performance of functions and offices transferred under this chapter and which were assigned and filled on the day before
May 4, 1980.