Report parameter variable in SSRS 2008 R2

Hi all.

Could someone please let me know if the following is possible in SSRS 2008 please.

I'm trying to create a report parameter variable where by I can store what I want the report to show in the column group. For example break down by age group, gender or ethnicity but only one of them. I can do this in SAS Enterprise Guide, just create a paramerter variable, but as we only use SSRS for surfacing reports on the web I wondered if the same could be done in SSRS 2008.

Could someone let me know if the functionality exists?

Many thanks