Revision of annual budget. The City Council may delegate
authority to heads of City departments, boards, or commissions to
delete, add to, change or create subclasses within object classes
budgeted previously to the department, board, or commission, subject
to such limitation or requirement for prior approval by the Budget
Director or City Manager as the Council, upon a two-thirds vote of
the members then holding office, may establish. By a vote of 2/3 of
the members of the City Council then holding office, the annual budget
for the City may be revised by deleting, adding to, changing or creating
subclasses within object classes and object classes themselves. No
revision of the budget shall be made increasing the budget in the
event funds are not available to effectuate the purpose of the revision.