Affects: Project Server 2007+
To delete/remove old Status Reports, do the following;
1) Navigate to the the Status Reports Page
2) Select the specific Status Report Request
3) Click Delete Request on the Toolbar
If you delete your REQUEST the associated RESPONSES for that Request will also be deleted by the system automatically. If, however, another PM has sent you a REQUEST that you need to respond to, then please ask them to remove their REQUEST.
Hope this helps.