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check this : http://obinsight.blogspot.in/2012/02/obiee-11g-configure-conditional.html
Create 3 reports with cols a,b,c (if u have drills remove for test)
-1st report: apply grand total and action link to report 2
-2nd report: apply grand total and col 'a' is prompted & action link to report 3
report 3: apply grand total and col 'a,b' is prompted
mark it helps ....