I finally found the right combination that tastes almost exactly like the Italian Subs! I used to use small, individual buns to make it but like the recipe I used on Saturday much better, so will be sticking to that from now on.
Hard salami, pepperoni, and ham slices
shredded mozzarella cheese
Italian salad dressing
Slice french bread loaf halfway. Lay meats on one side of bread. Layer onions, tomatoes, and cheese on other side. Bake in 350 degree oven for about 15 to 20 minutes. Once out of oven, sprinkle with shredded lettuce and pour Italian dressing over the sandwich. Close the sandwich "lid" and cut into manageable pieces. Enjoy!