|Not sure I am clear about what you are asking.|
You can record them from the stereo onto the computer one by one and save them
as mp3's if that's what you mean. You would need appropriate software. I use "HarddiskOgg" (free), see here:
With this you can record anything that is playing on your computer.
You would need to couple your stereo to your computer using whatever output is provided on the stereo for this purpose. You then need to switch your computer to the input you are using.
Always pop back and let us know the outcome - thanks