You can Archive a project from the Project Edit view.
Go to the Projects section, select the project you want to archive by clicking the checkbox.
Click the Archive button on the top.
How Archiving Affects Data
Archiving does not delete the project, which means that project’s data will be always available.
You cannot track time to an archived project.
You can run reports for archived projects.
Archived projects can be restored anytime.
How to Restore a Project
Go to Projects. You’ll find a quick link to your active projects in Show>All archived projects
Click on it to open the Archived Project list;
Select the project and Un-archive.