Thanks Guus, I tried it but still no go. Just to make sure, i'm pasting my query below for reference. Maybe i'm doing something wrong:
SELECT [Table1].Col1, [Table1].Col2, [Table1].Col3, [Table1].CustNum
FROM [Table1]
GROUP BY [Table1].Col1, [Table1].Col2, [Table1].Col3, [Table1].CustNum...