law: General Clauses Act, 1897
  21. Power to issue, to include power to add to, amend,
  
  vary or rescind notifications, orders, rules or bye-laws 
  Where, by any 13[Central Act] or Regulation, a power to 27[issue
  
  notifications],orders, rules or bye-laws is conferred, then that power includes
  
  a power, exercisable in the like manner and subject to the like sanction and
  
  conditions (if any), to add to, amend, vary or rescind any 26[notifications],
  
  orders, rules or bye-laws so 28[issued].