passing formula field between sub reports in a crystal report

Hi,
Iam a bit new to crystal report.
I have a report where i have nearly 3 to 4 sub reports within it and i believe the subreports are linked,where each sub report refers to views in database. i want to use a formula field calculated in one sub report to be used in another sub report.could u let me know how i can achieve this.

Thanks,
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