Well, for the most part, lilo and grub should be compatible in the sense that what one can do the other can too. I know that isn't really true, but it should be true of most things, especially the things needed to boot your average distro. I can't give you a set of rules to follow which will always work to translate from lilo config to grub config, just too many options really. If you post all of them I may be able to merge them for you by hand, but I can't promise anything. Honestly, I think you should do it yourself: the more you do the more you learn. I honestly don't think you will find an easy "do this one thing" answer to your post. You, or someone else, will probably have to sort this out by hand.