77. (a) The Sub-Federation shall be in charge of the Public Service Commission, the Audit Department and the High Court and matters placed under its jurisdiction by agreement, and along with the Federation, but to the exclusion of the Units, shall have powers of concurrent legislation over all subjects placed by this Constitution under the concurrent legislative jurisdiction of the Federation and the Units, provided that Sub-Units shall also have power of concurrent legislation over residuary subjects.
(b) The Executive Authority over the subjects of concurrent jurisdiction shall be shared by the Sub-Federation and Sub-Units as may be determined by an agreement amongst them endorsed bya Federal Law.