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Preheat the oven to 425°F.
Combine the meatballs and marinara sauce in a small pan and heat over medium heat.
Split the sub rolls in half and then place onto a baking sheet. Spread lightly with butter and sprinkle garlic salt on top. Bake for 3 minutes or until lightly toasted.
Place 4 meatballs on top of each sub, then sprinkle with mozzarella cheese. Fold the top over and bake another 3-5 minutes, or until the cheese is melted.
Enjoy while hot!