General Motors will drop the Corolla-based Chevrolet Prizm compact sedan range built at its California joint-venture factory with Toyota and begin producing a new Pontiac for the US and Japan, a plant executive told Bloomberg News. The New United Motor Manufacturing factory in Fremont will stop building the Prizm after the 2002 model year to begin producing the Pontiac and a new model Toyota Corolla, Bloomberg said, quoting John Mufich, general manager of information management at NUMMI.