Don't use the Disc Duplicate Tab to do this. That creates a temporary file that is automatically deleted after you are finished making your backup copies.
Use the Import Tracks Tab. You can selectively import each song track as a separate file. You can specify the drive, directory, subdir, etc. You will see that you must name each track you have selected for import. You can use the Autoname function, or custom name each track. These names become the file names on the hard drive.
Then, when you later want to make a new disc of some of these songs, go to the Custom Assembly Tab, and... well, read the manual for the details.
That's how you do it.
