Is it possible to pass a formula value from a sub-report to a main report

Hi there,
Im trying to pass a formula value from a Sub-report back upto into my Main report but the value doesnt seem to be getting passed up. Ive tried it the other way around, that is, passing a value from the main report to the sub-report and that works fine.
Below is an example of what I am trying to do but it is not working. In my sub-report Ive declared a formula variable as,
formula name=main_subIntRatePageCount
Shared NumberVar subIntRatePageCount := TotalPageCount;
and in the Main report Ive declared the formula variable as,
formula name=subIntRatePageCount
Shared NumberVar subIntRatePageCount;
subIntRatePageCount;
I want the value assigned to "subIntRatePageCount" in my Sub-Report to be available to my Main report.
The problem I am trying to solve is that the sub-report is spilling over onto two pages, and I need a way of updating the page display on the main report to reflect this. The page display is of format, "displaying page 1 of 3", but its not taking into account the extra page produced by the sub-report, so it should say "displaying page 1 of 4".

Also thanks Raghavendra, Asha,
I've tried adding the "whileprintingrecords" statement but that doesnt seem to make any difference.
I notice that the subReport is being called from my the GroupFooter section of the main report, and I am trying to reference the variable in the main repot in the Page Footer section. Could it be that the variable hasnt been calculated in the Page Footer by the time I calculate it in sub-Report? I thought Crystal Reports does at least 5 passes over the report evaluating all the formulas before it prints the report?
The problem Im trying to solve is I need to know how many pages my report will have before its completed, so that i can print the statement "displaying page 1 of X", and X is currently not being calculated correctly because the sub-report is printing onto 2 pages and not 1 so the report thinks I have 1 of X pages and not X+1.
Regards
Robert.

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http://help.sap.com/saphelp_nw70ehp1/helpdata/en/bd/589b3c494d8e15e10000000a114084/frameset.htm
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Is it possible to pass a formula value from a sub-report to a main report

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