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Hilton Hotels Corp. filed legal motions in federal court seeking to halt ITT Corp.’s planned breakup into three companies, a Hilton spokesman said. The filing, made in U.S. District Court in Nevada, is Hilton’s latest move in its six-month, $6.5-billion hostile takeover bid for ITT, the New York-based owner of Sheraton hotels and Caesars casinos. In July, ITT unveiled a comprehensive plan to thwart Hilton’s efforts. It intends to split its operations, buy back stock and refinance debt. ITT also filed a motion in federal court seeking a declaratory judgment against Hilton. Beverly Hills-based Hilton answered ITT’s motion in the filing, which seeks a ruling enjoining ITT from taking any steps to implement the plan. . . . Berkshire Hathaway Inc., the insurance holding company controlled by billionaire investor Warren Buffett, named Ronald L. Olson to its board. Olson, 56, is a senior partner at Munger, Tolles & Olson, a Los Angeles-based law firm. . . . Irwindale-based H.F. Ahmanson & Co. said its chief financial officer, Kevin Twomey, has been given the title of vice chairman.