My lillies are in pots Guest, and just come back every year without having to do much more than water and feed them.

Hi Guest you can either detach the small bulbs and grow them on to flowering size in a separate pot (which is what we do with our show bulbs) or you can simply leave them in the pot to grow on to flowering size if the lilies are just for your enjoyment. The small bulbs will take a few years to reach flowering size.