The program comes from the click-and-collect online ordering system that has been a success for North Carolina-based Harris Teeter Stores, which Kroger acquired in January. Now Cincinnati-based Kroger , the nation's largest operator of traditional supermarkets, has started a test program with its employees at the Liberty Township Kroger Marketplace, said Rachael Betzler , spokeswoman for Kroger's Cincinnati/Dayton Division.