Place cake cubes in large bowl. Sprinkle with liqueur if desired; let stand 30minutes. In a medium bowl, combine confectioners' sugar and cream cheese; beat until blended. Reserve 2 tablespoons whipped topping; fold remaining topping into cheese mixture. Stir topping mixture and pecans into cake cubes; mix well. Spoon cake mixture into a pretty glass or crystal bowl. Spread cherry filling evenly over top. Or, if desired, layer one-half cake mixture and cherry filling; repeat