how to create input control to webservices

Hi,

I am beginner to the Jasper(Using "JasperReports Server 6.2.1" and "Jaspersoft Studio Profesional 6.2.1"). I have a parameter called 'licenceStatus'  in my jasper report, how can i create input control for that using webservices and input control should be a dropdown in my case.

Please let me know how to achieve this functionality.

Thanks,
Bhavani