You can use Project Start Date and rebase all project task based on their duration or existing start and end time.
- Navigate to edit project you want to rebase omniWorks \ Projects, select Edit.
- Select Schedule section.
- Configure a new project start date.
- Optionally select Send Email or Send SMS update or both. If send update is selected, once task is rebased, an update will be send to a task workflow .
- Click Rebase Project Tasks.