Hi,
About administrators
http://www.symantec.com/docs/HOWTO55478
Managing domains and administrator accounts
http://www.symantec.com/docs/HOWTO55094
Adding an administrator account
http://www.symantec.com/docs/HOWTO55403
About access rights
http://www.symantec.com/docs/HOWTO55041
Configuring the access rights for a limited administrator
http://www.symantec.com/docs/HOWTO55037
How to change Manage Group permissions for Limited Administrators in SEPM for multiple groups.
http://www.symantec.com/docs/TECH92651
I hope these articles can help you.