Parse the selected iTunes tracks' Song Names such that the same first Item text in "First Item - Second Item - Third Item" is removed and copied to another user-selected tag in each selected track (Album, Artist, Composer, Genre, Grouping, or Comments), leaving "Second Item - Third Item" in the Song Name. Run the script again to similarly remove and copy "Second Item" to another tag, and so on. Read Me explains more, and how to customize for different separator characters. Screenshot speaks volumes.
(Note: In order to launch this PowerPC-era script on an Intel machine, it must first be opened and then saved using AppleScript Editor, which is located in your /Applications/Utilities/ folder. More information is here.)
Update subscriptions which have expired by virtue of being ignored for five or more days
Sort purchased tracks into discrete playlists by name or account ID
Convert selected tracks and export the converted files to a new folder
Convert or import tracks with any encoder on the fly
Exports and then re-imports selected tracks' artwork
Change the settings of hidden iTunes preferences