Thank you. For the most part it worked except that I am not able to group by client ID. I can group by staff and program. Below is the Iif expression. Where am I going wrong.
=iif(
Parameters!GROUPING.Value = "Staff", Fields!UserCode.Value
, iif(
Parameters!GROUPING.Value = "Client ID", Fields!ClientID.Value
, Fields!ProgramName.Value
)
)