Thanks MoonKhanna for your help. I was able to create the custom_instantiation.cfg file. I put it into the correct WORKAREA under the workflowModels and submitted to STAGING AREA. I am able to see the ui as I expected with the radio buttons showing up. However I still don't understand how to call a javascript function correctly depending on "onClick" or "OnChange" events. Please see the attached custom_instantiation.cfg file. Here I am trying to call show and hide javascript functions when a radio button is clicked however that never happens. I don't see any alerts. The javascript is not working as I expect. There must be something I am still missing here. Can you please guide me?Thanks a lot for your help!-Gautam