How do you end up with extra drawn frames of comb, for future use and for swarm control? Would it be as simple as in early spring once temps are steady and taking 2 or 3 frames of sealed brood in a tight pattern, putting it in an additional box with an inner cover between the additional box on top and the brood box(es) below? Do you keep the nurse bees with those brood frames up top? What are the uses for empty drawn frames, in addition to swarm control?