Revisiting Mayor's Vow To Cut Office
New York City Mayor Michael R Bloomberg pledges to cut his office by 20 percent and calls on other elected officials to do same; city budget calls for spending total of $78.6 million on mayoralty this fiscal year, up from $78.3 million last year; administration officials say that those figures are misleading and that Bloomberg has met his goals of cutting both budget and staff of mayor's office by 20 percent; Bloomberg officials say that by not filling vacancies they have cut headcount of mayor's office by 412 from 627, 34 percent cut, and that they have trimmed budget by $7.8 million over period of 18 months, for 20 percent cut (M)