Passing parameter to cda datasource through URL

Hi

http://localhost:8080/pentaho/conten..._tab_raw_data&par_category=9&par_subcat=229&outputType=html

par_category and par_subcat are the parameters defined by me. I am not able to pass these parameters to CDA datasource through this URL. Although URL works fine with the environmental variables like path and outputType.

Thanks
Vipin Goyal