Transitional provision preserves earlier central excise orders as valid where consistent with the new rules and updates references. Transitional provision deems notifications, circulars, instructions, standing orders, trade notices and other orders issued under earlier Central Excise rules and in force at commencement to be valid under corresponding provisions of the Central Excise Rules, 2017, and directs that references to earlier rules in pre-existing instruments be construed as references to the Central Excise Rules, 2017 and corresponding provisions.