Sorting in SSRS 2005

Hi,

I am using SSRS 2005 and need some input on below scenario:

I have created one report parameter , for ex., @Param and I am assinging some hard coded values to it for ex., AB, CD, EF...

Now when we select AB from the prompt it should sort the column A and then column B in the report (i.e. from table)

When we select CD from the prompt it should sort the column C and then column D

When we select EF from the prompt it should sort the column E and then column F

Can we achieve this in SSRS 2005? by putting some custom sort expressions?

Please advise.

Thanks