In your Audio Montage, go to the CD tab, and you can get to the CD-Text by either going to Functions - Edit CD-Text, clicking the big T just above pause, or by double-clicking under the CD-Text column in the file list. You can skip to the previous/next track's info with buttons on the bottom. When you select a track (any but the first one, which is the info for the disc itself), you can hit the Copy button next to the title, and the filename will be copied to the CD-Text track name.