In medium saucepan, combine caramels, 3 tablespoons whipping cream and 3 tablespoons margarine; cook over low heat, stirring frequently, until caramels are melted and mixture is smooth. Remove from heat. Stir in 3/4 cup powdered sugar and chopped pecans. (Add additional whipping cream a few drops at a time, if needed for desired spreading consistency.) Spread 1 teaspoon warm filling on each cookie square.