The Secretary of Commerce may authorize such Foreign Service officer as Secretary of State shall make available to perform duties of China Trade Act Registrar under his direction. The official station of the registrar shall be in China at a place to be designated by the Secretary. All functions vested in the registrar by this chapter shall be administered by him under the supervision of the Secretary; except that upon appeal to the Secretary in such manner as he shall by regulation prescribe, any action of the registrar may be affirmed, modified, or set aside by the Secretary as he deems advisable.