Set Fixed size of structure of rdlc report

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ASP.NET

SQL-Server-2008R2

Hi, I have a Web application in which I have used rdlc report for reporting. I gave a sub report in main report(main report contains a header and some fields). Sub report is intended to display table records and there are some main report's fields below the sub report. So the height of the table varies according to the data populated. Then then the fields' position in the main report are getting changed when there is less records gets populated into the table. But my user want's their positions to be unchanged. How to fix the table height in rdlc report irrespective of the records being populated ? It's an urgent please help.......any body thanks in advance...