Export SSRS report to Excel

Need help in setting up the URL for exporting the data from .rdl to excel.

I have a A.rdl and when I click on export to excel I need it to open B.rdl in the Excel format taking the input parameter from the A.rdl is this possible?

I am providing the URL in the Action field but I am not sure if that is right, please need help in the Structure of the URL.

Thanks,

Vijetha