To create a change request:
You can raise a change request from your project. This creates a change request opportunity. For instance, you can use this when you need to request additional budget for a project, or if a change is to be made to a project that is outside the scope of the work that was originally agreed. You can then create a new project from the change request opportunity. When you do this, you can view the related projects in the Primary Project For Opportunities related list on the original project record.