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.
Perhaps Also of Interest...
downloaded 12m 39s ago
Copy Artist to Album Artist of selected tracks
downloaded 31m 28s ago
Exports and then re-imports selected tracks' artwork
downloaded 31m 40s ago
Gather audio tracks whose files contain no artwork metadata
downloaded 51m 29s ago
Apply selected CD's CD Text to its disc and track tags
downloaded 51m 43s ago
Use tag info from selected track to search Amazon Books for cover art
downloaded 53m 45s ago
Move selected playlists to a new or existing folder