Cook tortellini according to package directions; drain and rinse in cold water. In a resealable plastic bag, combine the tortellini and salad dressing. Seal bag and refrigerate for 4 hours. Place a slice of cheese on each slice of salami; roll up tightly. Cut into thirds. Drain tortellini and discard dressing. For each appetizer, thread a tortellini, salami roll-up and olive on a toothpick.