Hi Yalagala,
First of all there are many blogs and videos on Single Sign On, Few are mentioned below.
BusinessObjects 4.0 Single Sign On (SSO) with WIN AD
Links:
http://scn.sap.com/docs/DOC-26314
Active Directory SSO for SAP BusinessObjects BI4Tomcat for SAP BusinessObjects Business Intelligence platform 4+
Links:
http://scn.sap.com/blogs/josh_fletcher/2012/06/11/active-directory-sso-for-sap-businessobjects-bi4
SAP BusinessObjects BI4 Active Directory SSO Configuration
Links:
http://www.youtube.com/watch?v=EbpoIvh1Ue4
SAP BO - Single Sign-on(SSO) add new user
Links:
http://www.youtube.com/watch?v=DwQYKBCSjog
Hope this will help you as well.
Thanks,
Daya Shankar Jha