Heritage Communications said it completed the previously reported purchase of Warner Amex Cable Communication's Dallas operations for about $110 million . . . Citicorp, the nation's largest bank holding company, has changed its ticker symbol on the New York Stock Exchange to CCI . . . Atlantic Richfield said it expects to close the previously reported sale of its American Brass division to Buffalo Brass Co. on Oct. 15 . . . The Investment Company Institute reported that the assets of the nation's 351 money-market mutual funds fell $516 million in the week ended Sept. 25 . . . The Los Angeles Department of Water and Power reports that electric production for the week ended Sept. 21 rose 0.70% from the week before.