(1) Subject to subsections (2) and (3) and sections 44, 45, and 46, the Minister may, by a Reallocation Warrant, direct the accounting officer that savings arising from an item in the expenditure classification approved by an appropriation law, be applied in aid of an item in another expenditure classification in the Estimates, or to a new item of expenditure and the amount to be applied is deemed to have been appropriated for that purpose.