Hi,
Check this artical
Deploy DLP Endpoint Agent By Active Directory GPO
https://www-secure.symantec.com/connect/articles/deploy-dlp-endpoint-agent-active-directory-gpo
Installing the DLP Endpoint Agent with Altiris
https://www-secure.symantec.com/connect/articles/installing-dlp-endpoint-agent-altiris
Check this thread also
https://www-secure.symantec.com/connect/forums/how-push-dlp-agent-ad