Preheat oven to 350 degrees. In a large bowl combine 1 cup flour, brown sugar, salt, baking soda, oats and melted butter. Beat at low speed until well mixed. Evenly pat into an ungreased 13 by 9-inch baking pan. Bake 10 minutes. While waiting, stir caramel topping and 3 Tbs of flour. Mix well. Remove pan from oven and spinkle with chocolate chips and walnuts. Drizzle on caramel mixture. Return pan to oven and continue to bak another 20 to 25 minutes. Cool totally before cutting. Cut into 36 bars. Can be frozen.