Subject to the provisions of these rules any power conferred by these rules to make, approve, frame, pass or adopt any rule, order, resolution, determination, decision, appointment or scheme, or to give any consent or settle any constitution, or to prescribe the manner of doing anything, shall be construed as including a power, exercisable in a like manner and subject to the like conditions, to revoke or vary any such rule, order, resolution, determination, decision, appointment, scheme, consent or constitution, or anything so prescribed.