Layer in this order on the bottom half of the bread: cheese, ham, pepperoni, and salami.
Spoon ½ to 1 cup olive salad, evenly, on top of salami. Replace the top with bread. Wrap in aluminum foil and press tightly together and let sit 30 minutes to an hour. You can also heat it in the oven if you prefer. Heat at 350° for 15 minutes then rotate and heat another 15 minutes.
This will keep the salad and sandwich from falling apart so much when you try to eat it.
Store leftovers in an airtight container in the refrigerator for 3 to 4 days.
Notes
Olive Salad1/2 c Greek olives, chopped1/2 c chopped green olives stuffed with pimentos, chopped1/2 c pickled Italian vegetables1/3 c olive oil1/2 tsp crushed oregano2 T parsley1/8 tsp pepperCombine all ingredients and let sit overnight in an airtight container