Hierarchical projects

we have hierarchical structure for our projects and we want to have project in project structure and tasks can be a separate project by themselves and employees can fill timesheet for projects or sub projects depend on permission. please help me for doing so
thank you very much

As per my knowledge, Sub project feature is not available in ERPNext. But you can create Task and subtasks against a project and employees can fill the timesheet for subtasks. So there will be a parent task and child tasks under the same. Thank you

thank you