I need to pass the value of one field in my main report to subreport. Could
I do this?

thanks,

Yes, you will have to use the SharedNumbervar variable type.Declare the
field in your subreport, and call it up in your main report.

Sorry - I just read your message again. Still you need to use the
SharedNumberVar variable - declare it in your main report and the call it up
in your subreport - I think this should work - I've only ever done it the
other way around - ie subreport to main report.