How to make drill through parameter to select all ssrs

Hi,

I have a report "A" with 5 parameters and Report "B" with 5 parameters. I wanted a drill through on a column. so I am trying to pass 3 parameters from Report "A" to 3 parameters in Report "B".

But for the remaining 2 values in Report "B", I want the report to select all as default. I want this to happen only in case of drill though action. Normally in Report "B"user should select value.

Can there be any expression to make it select all while assigning values during drill through action.

Please help.

Thanks