I have often wondered the same thing. I really don't think that there is a way to append the track number to the song name. Other than munally typing it in. iTunes could not gain that info from a download unless the song title already had that track number included in the file name. I don't know if that is what you were getting at.
If you mean that you want the songs to appear in order when you view them in iTunes then you would need to put the number before the track name and click on the "song name" button in itunes to organize numerically/alphabetically.
Dolomite, the tough black mineral that won't cop out when there's heat all about.
To add to jazzman's post, the artist and album names have to match exactly for each track. e.g. Artist "X" will be treated differently than "X featuring Y" or "The X" and will be kicked to the bottom of the list no matter what track number. Ditto for Disc Number - a track without those fields filled in will appear in a different order if mixed among tracks with them filled. If your music still doesn't list the way you expect, check for and delete spaces before and after artist or album names.
You make a living by what you get. You make a life by what you give.