Hello Ravi,
Are you looking for an interactive PDF output of webi? Only the displayed data can be exported to PDF and you cannot make any selections in PDF. If you want to have radio button in launchpad view, you can implement it using input controls and then export out to PDF. PFB link
http://blog.davidg.com.au/2011/09/dynamic-measures-in-webi-on-any-data.html
If you want an interactive PDF interface, only option is create a dashboard with graphical summary of two selections and pass the selection through open doc url and open webi report from interactive pdf dashboard.
Hope it helps.
Best Regards,
Nikhil Joy