HTC :: Hero Best Way To Manage Music On Phone

Ok I am trying to figure out the best way to manage the music on my phone. I thought I would be able to copy over a playlist from the computer but that does not seem to be the case, every time I do it no matter what the format is it always ends up being deleted.Now I am actually reading the owners manual and it says this: Tip You can also create and use folders to organize your music inside the Music folder you have created.This would be super easy to create playlists by if I could figure out how to brows the music by folder and then add all the music in that folder to the playlist. Anyways its on page 133 of the manual if you have any questions. So what would be the best way to create playlists of something that is in a folder on the phone?