Updating Projects
You can add and delete Project Tasks, and also create, update, and delete Project dependencies. Additionally, you can edit Project Task labels, convert Project Tasks to milestones, and mark milestones as completed.
To update Projects:
1. In the Project view, do one of the following:
In the left pane, right-click a Project Task.
In the right pane, on the Project Gantt, right-click a Project Task block.
2. On the Task Action Menu, click an available option to make updates, and then in the Project Template view, in the bottom right corner, click Save.
* 
Project Summary Tasks(the root or top task in a Project) cannot be deleted.
Published Project Tasks and their related parent and ancestor Project Tasks also cannot be deleted.
Published Projects are updated to Partially Published status when you add and save new Project Tasks.
For more information:
Was this helpful?