1. Heat oven to 400 degrees F. Slice bread into about 16 thin slices, stopping about 1/4 inch from the bottom of the loaf so that the slices remain joined. Overlap 2 pieces of aluminum foil to make a big square and spray with cooking spray. Place bread on foil.
2. Spread every other slice of bread with sun-dried tomato spread to create 8 "sandwiches". Make filling by layering meat and cheese into 8 bundles: Layer 2 slices of provolone with a slice of salami, ham and sopressata and top with sliced mozzarella, pepperoncini and olives; fold each bundle in half and wedge into each sandwich. Wrap entire loaf in foil and place on a baking sheet.
3. Bake loaf until cheese is melted all the way through, 35-45 minutes. To serve, cut each sandwich from the loaf.