In a small bowl, combine orange juice concentrate, steak sauce, sherry and garlic. Place steaks in glass dish; coat with 1/2 cup orange juice mixture. Cover; chill 1 hour, turning occasionally. In a small saucepan, over medium heat, heat remaining orange juice mixture; keep warm. Remove steaks from marinade. Grill over medium heat for 4 minutes on each side or until done, turning once. Serve steaks with reserved warm orange sauce.