You can use the Clone-A-Job app to duplicate an active or completed job.
This app will copy high level project information, tasks and allocated time.
Here is the link to access the app:
Clone-A-Job App: https://labs.proworkflow.com/clone-a-job/
To login, enter your ProWorkflow account URL, username and password.
Here's a quick video guide: https://www.youtube.com/watch?v=Khe90tMa67Y