Visual Studio :: Additional List Item With More Than 1 Value

I am using VWD express 2005. I have a drop down list that filters a datagrid. I use select distinct to populate the DDL and the datagrid is filtered using

SELECT * FROM tbl3 WHERE (REP LIKE @rep + '%')

However I want to add an entry to the DDL that includes more than 1 value. If I add a new listitem to DDL with text = sales and value = c21 then query is ok but what I'm trying to do is is where value = c21,c22 A sort of group option? Am I going about this the wrong way? I tried value = c21,c22 then c21 or c22 then (c21,c22)