Filling custom tag in tag panel with default content


I've added the original year field in the tag panel. I would like it to be filled by default with the content of year field. Is this possible? If so, how do I do this?

AFAIK, there are no default values for fields. You could use an action to copy one field to another if the second doesn't exist.

Thnx, could this action be automated for each time I load content in Mp3tag?

Not that I'm aware of.