Some of my files have entries in 'Contributing Artists' and 'Publisher'. I would like to edit or blank these entries. MP3tag doesn't seem to have entries for these fields. I created a custom column with extended information for 'Publisher' but it didn't populate with the information file information and there was no corresponding entry for 'Contributing Artists' so I couldn't create a custom column for that one. Is there a way to edit these fields in MP3tag?
I’m assuming you are referring to the information you see in Windows Explorer when you mention Contrbuting Artists.
If you select one of these files in mp3tag and press Alt+T to open the Extended Tags window, you will see each field that has been stored including the name of that field. You can edit these fields directly in this window for each file, or in groups.