I have given it some thought. I have seen a lot of people use a number system and keep records of it all. For me i think it will be easier to track them by their names. But now that i think of it, I'm sure a lot of people use numbers since their seedlings don't have any names. But i bought a notebook that i can record things in, of which I'll track the height, color, bloom and foliage shapes and colors, type of lily it is,asiatic oriental etc. Along with dates it emerges and dates of the first bloom. Then whatever crosses i attempt, if the pollination takes then I'll get another notebook to record the seedlings.
Now what crosses i might try this year will be limited to the already established lilium I had previous to this year, and obviously keep it in the same division. Maybe once i get second going I'll come up with my own numerical system that i can understand.