It has to be done just once Jou Chen, not for every new task.
Basically, if you first created the project, the next steps have to be performed in order to transfer the project ownership to the new PM:
- In PWA, open the project dtails from the project center and update the project owner. Eventually, add it to the project team.
- In MS Project Pro, the new owner has to insert the status manager column and add himself to all tasks and publish the project in order to set him as the approver for task updates.
Once those steps done, there is nothing more to do, just running the project execution. When the PM will created new tasks or update existing tasks, he will be the status manager automatically, so he won't new to do the steps again. This is just a "one
shot" operation at project creation.