CONSOLIDATED NATURAL <CNG> FORMS TRADING UNIT Consolidated Natural Gas Co said it has received Securities and Exchange Commission approval to establish a wholly-owned natural gas marketing subsidiary called CNG Trading Co. It said the new unit will operate in New York, Pennsylvania, Ohio, West Virginia, Louisiana and Texas and compete with other markets for delivery of low-cost natural gas supplies. Consolidated said customers' needs will be met from a wide range of low cost sources, including the spot market, independent producers and brokers, and Consolidated's producing affiliates - CNG Development Co of Pittsburgh, and CNG Producing Co based in New Orleans.