Create Hierarchy node level Authorizations...
You can assign the respective nodes to the concerned user. You take help of Security team or BASIS to get help on this.
http://help.sap.com/saphelp_nw04/helpdata/en/8f/57f438114ee836e10000000a114084/content.htm
http://scn.sap.com/community/data-warehousing/netweaver-bw/blog/2012/05/22/authorization-in-bi-7
Regards
KP