I'm sure there is if your can find the wiring diagram. And that's the rub... Finding the correct wiring for your trailer.
Otherwise, you need to check/find the wires to each motor... And write down the color coding used for each slide. Hopefully, each slide will use different color coding on the motor wires. Then pull your switch out. You need to see how they wired your one switch. Did they gang everything together? Did they use a buss bar? A relay? Once you figure that out, your should be able to separate the wires to each slide and add a switch for each.
On the other hand, if they used one set of wires for all the slides.... Then you will have to trace the wires to separate each slide. Or run your own.
I take it you only have a switch, not a remote control. If you do have a remote, then you may be able to program the board separately.
Actually sounds like a fun project. Will sure help you learn about your RV!
2015 Sierra 1500 Denali
2014 Coleman 249RB
David Jon Devoucoux
People, Places & Things...for over 40 Years!