Hi Chetan. If you want to add stages to your case, please use the case designer and click add stages if your case does not have stages yet. You can then use the section pxDisplayStages to show the runtime stages of your case. This is provided in the out of the box harnesses. If you are trying to use status groups (which have been deprecated since 7.1 GA) you can only use them on the Case Type ruleform. The tab is conditional that you are not using the current stages so make sure you dont have any stages if you want to use status groups as these will contrict eachother.