Reheat oven to 350 degrees. Prepare cake mix as pkg directs. pour 2 cupsbatter into greased 13x9-inch baking pan; bake 15 minutes. in heavysaucepan, over low heat, melt caramels and margarine. Remove from heat; addcondensed milk. Mix well. Spread carmel over cake; spread remaining cakebatter over carmel. Top with nuts. Bake 30 minutes or until cake springsback when lightly touched. Cool.