Hi Khadka & Srini,
I had a similar requirement in Obiee10g.
In, Obiee10g - i created Check box prompt and passed the prompt value to the presentation variable in the dashboard.
I hope this should help you:
Prerequistes to do this one is : Java Scripting and idea of 'Go Url' Method in Obiee.
Regarding 'Go Url in Obiee' you can check the http://sureshotstrategies.wordpress.com/2008/12/13/integrating-oracle-obiee-content-using-go-url-syntax-2/
My Approach as per my requirement:
2. Create a seperate dashboard page which has 'Text Dashboard Object'
4. Send me your email id - so, i can send you java script which and furthure info.
I need to set a presentation variable without using GO Url method. But, let me see your code for presentation variable and if I could come with some workaround with that. My email is firstname.lastname@example.org