June-July take cuttings of firm new growth. apply 0.3 to 0.8% IBA (Rooting hormone) stick in well drained soil & mist takes 30-90 days to root.

Is it possible to seperate some of the well developed roots at the bottom of the lilie replant them and expect a new plant? Or do you just seperate the new plants and thats all you get? Any other options other than cuttings which can take up to 90 days?

You should be able to separate some of your new bulbs from the old including some root. If you want to propagate a lot of them do a search on 'scaling lilies'. Al