How pass one parameter value to the other parameter in SAP Crystal report.?

Hi every one,

I have dependent parameters in crystal report.

Ex : I have two parameters  : Parameter 1 (P1@select cardtype from ocrd)

                                           Parameter 2 (P2@select cardcode,cardname from ocrd where cardtype='P1.value')

Depends upon the Parameter 1 I need to generate Parameter2 values

How to achieve this ?

Please suggest

Thanks and Regards

DEV