You can retrieve the source of a *WSCST using the RTVWSCST command. It is then possible to edit the WSCST source and recreate it using the CRTWSCST command. The editing of the WSCST is not easy to explain – it’s something I’ve managed to do before by trial and error. I haven’t seen any good resources on the internet explaining this either.
Make sure you take a backup copy of your existing *WSCST before you start.