Note You must have Modify permission for the Site security object class or instance to perform this procedure.
Systems
Management Server
Site Database
Site Hierarchy
site
name
Site
Settings
Site Systems
Deleting the site system deletes all previously assigned system roles. If you want to delete only a single system role, do not delete the site system; instead, modify the site system properties.
Note You cannot delete a site system that has roles that are assigned automatically by SMS.
Site Systems Configuration Overview