The council in its reasonable discretion may, in any year, by motion, modify the budget after its final adoption. New appropriations, supplementary appropriations and transfers from one appropriation to another may be made during the fiscal year, either before or after the expenditure is authorized or ratified after the expenditure is made, if it is within the current year's revenues, or the money is promptly made available through borrowing as allowed by law.
8 Pa.C.S. § 1312