Crystal Reports Shared Variable in Subreport

Message

     Hi,

I have a requirement like this

My Report Structure

MAIN REPORT
-------------------------------------------------------------------------------------------
Col1        Col2         Col3       SubRpt1             SubRpt2               SubRpt3

I have one shared variable in Main Report 

shared numbervar COUNTER;

I want to do some manipulation on COUNTER variable in 

SupRpt1-->SupRpt2-->SupRpt3 [HERE SEQUENCE IS IMP]

I want to process my COUNTER vairable sequenctially through SubRpt1 to SubRpt3.

And Final result I want to display in SubRpt3

But here my problem, iam not able to control the sequence of Execution for COUNTER Variable in subreports.

It's getting randomly executed.

First it is excuting in SupRpt3 then SupRpt1 And in the End SupRpt2.

I want to control it's sequence or any other solution to acheive the desired functionality

Thanks
Siraj