Jim, Roger has a good approach. I use the Favorite Songs function for almost exactly the purpose you want. Select the yellow SD button, then the third item on the left "Favorite Songs". See top of page 150 of your manual.

The Favorite Songs that you list, are on the SD card that you are using. If you have different venues that need different songs or play lists, you can use a different SD card for each venue and the list of songs in your play list will be shown at the first page of favorite songs in that SD card. All of the SD cards can be identical except for the Favorite Songs list.

Favorite Songs are not necessarily songs. In my case they are all song setups. They are simply a link to a specific location on the SD card and they load whatever is at that SD card location.