Playlists within playlists?

> You can delete your current playlist and start all over again.
> Click Library, then click (lefthand column) My Playlist and delete current
> list. Then create a new one. WMP will create this tree by default.
>
> "Kerry" wrote:
>

> > I would like to organize playlists into a hierarchy similar to a file system
> > tree. Playlists can have sub-playlists. Child playlists can be expanded by
> > clicking the "+" symbol of the parent playlist.
> >
> > I saw this displayed in my own WMP 10 library once, but it had been created
> > unintentionally somehow and subsequently deleted before I learned how it came
> > about.
> >
> > Anybody know how to do this?

> I'm not trying to recover a lost playlist, I asking if there is a way to
> organize playlists within other playlists, like an outline:
>
> Top Playlist
> |
> +|----Subplaylist1
> |
> -|----Subplaylist2
> |
> |----Subplaylist3