Add a new stage to an existing GoCD pipeline
Now that you have a pipeline with a single stage, lets add more stages to it.
* Navigate to the new pipeline you created by clicking on the Edit link under the Actions against it. You can also click on the name of the pipeline. 
* Click on the Stages tab. 
* You will notice that a defaultStage exists. Click on the “Add new stage” link. 
* Fill stage name and trigger type.
* Fill in the details for the first job and first task belonging to this job. You can add more jobs and add more tasks to the jobs.
* Click on help icon next to the fields to get additional details about the fields you are editing. 
* Click “Save”.
