Adding metadata column to Tag Panel

I'm running mp3tag v. 2.49b On Windows 7. I'd like to know if there's a way to add one element of the metadata to the tag panel on the left side of the program. Right now I have to go through extended tags (CTRL+T) in order to change the supplier information as well as the website associated with the files I'm tagging. If that's not possible, is there anyway to set a default entry in both supplier and website like I can currently do with the comment in the tag panel?

Thanks in advance

Yes, you can add fields to the Tag Panel. Go to Tools > Options > Tag Panel. Click the 'Add field...' button, select or enter your field name, then give it a label in 'Name:'.