CLEVELAND, Tenn. (AP) — A MARS Chocolate plant in southeastern Tennessee is adding assembly lines for its new Pretzel M&Ms and the plant manager said the expansion will create 50 jobs.The Cleveland MARS plant manager, Joe Burton, told the Cleveland Daily Banner the company will invest $60 million over the next two years to install two new assembly lines.The plant makes M&Ms, Twix and Pretzel M&Ms.