Fightin MIke, I think if the songs are shared via a mapped drive you can do it… just not with the itunes sharing function.
Dodge mike… Open itunes and go to preferences… In one of the tabs (It’s advanced on macs… I dunno about PC’s) Uncheck copy music to iTunes Music Folder when adding to library…
You may also want to change your library, that way it will copy any new songs you acquire to the network drive.