SX600 works as computer: directory and files name. You need to create a new playlist and add the rregistration memories. Save this playlist with diferent name. Do it as you did with the first playlist.When you click on save, it will let change the name.
To preserve anything on SX600, copy the files (playlist, song, pad ....) and save it with other name or in new folder (a new foldr created and named as backup folder for example). A Flash USB is a good idea to it: no use of internal memory.
To create a new playlist, press button 8 OPTION.