(a) Except as otherwise provided by law, and in consultation with the Secretary of Commerce and, as appropriate, the heads of other relevant agencies, the Secretary may amend, modify, or revoke provisions of this part at any time.

(b) Except as otherwise provided by law, any instructions, orders, forms, regulations, or rulings issued pursuant to this part may be amended, modified, or revoked at any time.

(c) Unless otherwise specifically provided, any amendment, modification, or revocation of any provision in or appendix to this part does not affect any act done or omitted, or any civil or criminal proceeding commenced or pending, prior to such amendment, modification, or revocation. All penalties, forfeitures, and liabilities under any such instructions, orders, forms, regulations, or rulings pursuant to this part continue and may be enforced as if such amendment, modification, or revocation had not been made.