When working on a workshared project, you can rename a user-created workset to more accurately reflect its contents, purpose, or discipline. 
Note: You must be the owner of the workset to rename it. 
- Click Collaborate tab
Manage Collaboration panel
 (Worksets). 
 
- In the Worksets dialog, select the name of the workset and click Rename. 
 
- In the Rename dialog, enter a new name. 
 
- Click OK twice.