You can manually add tags to associate with a Network Security alert on the Alerts page by using the Central Management System appliance Web UI. The tags that you add manually affect only the alert to which they were added.
Central Management System (CMS) > Central Management System System Administration Guide Release 10.x > Appliances > Filtering alerts using tags and rules > Adding tags to alerts manually for managed appliances using the Web UI
Central Management System (CMS) > Central Management System System Administration Guide Release 10.x > Appliances > Filtering alerts using tags and rules > Configuring tags and values
Central Management System (CMS) > Central Management System System Administration Guide Release 10.x > Appliances > Filtering alerts using tags and rules > Adding tags to alerts manually for managed appliances using the Web UI
Central Management System (CMS) > Central Management System System Administration Guide Release 11.x > Appliances > Filtering alerts using tags and rules > Configuring tags and values