In a large bowl, cream butter and sugar until light and fluffy. Beat in milk and vanilla. Combine flour and salt; gradually add to creamed mixture and mix well. , Divide dough into five 1-cup portions; shape each into a 10-in.-long roll. Wrap individually in plastic wrap. Refrigerate for 1 hour or until easy to handle, or freeze for up to 3 months. Yield: 5 portions (1 cup each)., To use refrigerated cookie dough: Cut roll into 1/4-in. slices. Place 2 in. apart on ungreased baking sheets. Decorate with sprinkles, jimmies or colored sugar if desired. Bake at 350° for 7-9 minutes or until lightly browned. Cool for 2 minutes before removing to wire racks. , Or, bake according to individual directions for Jolly Santas, Lemon Rope Trees, Magic Stars, Reindeer Bites and Strawberry Tea Cookies., To use frozen cookie dough: Thaw in the refrigerator overnight. Bake according to recipe directions.