This was a recipe I learned at one of the restaurants I worked at as a teenager. It was a super easy, inexpensive dinner for a young mom, and it helped that all four of my daughters loved it. This wasn't the case with every meal.
Heat oven to 350.
Spread thin layer of Italian dressing on each half of bread. Lay cut side up on cookie sheet.
Layer on meats, cheeses, olives and sliced onions.
Bake just until cheese melts.
Remove from oven, put bread together, and slice.