What is the legal sanctity of an Adhoc committee formed for a Society?

Prior to handover from the Builder an Adhoc Committee has been formed to oversee operations and management handled by builder. Members pay quarterly maintenence amount to Builders account prior to the conveyance, and the Bills for Housekeeping and other activities are raised by Builder for approval to the Adhoc committee. Can Adhoc committee approve such bills shared by builder without a discussions/communication to all owners/residents? If there are some glaring escalations to the Bill Amounts eg Fire Equipment bill increased from 3 Lac (Prev Yr) to 7 Lac (Curr Yr) without much diff in service, Is the Adhoc committee authorised to approve these bills without discussion with all other members.