Brooks Atkinson Theatre, James Nederlander and Michael Myerberg, owner-managers, Alexander H. Cohen presents Anthony Quayle, Eileen Herlie in Peter Ustinov's new comedy "Halfway up the Tree," with Hanne Bork, Sam Waterston, Margaret Linn, Graham Jarvis, William Larson, John Tillinger, directed by Mr. Ustinov, scenery and lighting by Ralph Alswang, costumes by James Hart Stearns, associate producer Hildy Parks, production supervisor Jerry Adler.