hi ayush,
business warehouse earlier version is called as bw 3.5 then later on after 7.0 version its called as bi 7.0,7.3 & now almost 7.4.
you can connect the bw query directly to dashboard using "sap bw netweaver connection", finally you will be publishing the reports in NW portal.
To integrate the dashboard into the crystal reports, the following links can be helpful.
http://www.clariba.com/blog/dashboard-integration-in-crystal-reports-using-flash-variables/