Combine caramels and 1/3 cup milk on top of double boiler. Stir until melted. (Microwave works well for this also.)
Combine cake mix, remaining milk and butter. Blend until mixture holds together. Stir in nuts. Press 1/2 of cake mixture in a greased 13 x 9 inch pan and bake for 6 minutes at 350 degrees. Remove from oven and sprinkle chocolate pieces on top. Pour melted caramels evenly on top. Crumble remaining mix over caramels and bake at 350 degrees for 15-20 minutes. Cool slightly and cut into bars.
