In a large bowl, combine tortellini, salami, provolone cheese, corn, artichoke hearts and olives. Mix gently, as the pasta is delicate and will break apart easily. In a small bowl, combine dressing and 1/2 of the Parmesan cheese. Pour the dressing over the pasta mixture and toss gently. Top with remaining Parmesan cheese to finish. Refrigerate one hour to blend flavors. Before serving, top with pimentos.