Carmel fudge cake

1. Reheat oven to 350 degrees.
2. Prepare cake mix as pkg directs.
3. Pour 2 cups batter into greased 13x9-inch baking pan; bake 15 minutes.
4. In heavy saucepan, over low heat, melt caramels and margarine.
5. Remove from heat; add condensed milk.
6. Mixi well.
7. Spread carmel over cake; spread remaining cake batter over carmel.
8. Top with nuts.
9. Bakei 30 minutes or until cake springs back when lightly touched.
10. Cool.