If you are asking whether you can bring an Excel spreadsheet into QV as a data source, the answer is yes. You can do this in the load script by clicking on the Table Files button and selecting the spreadsheet you are tracking the customer codes in. If you are manually tracking the codes in Excel, you might think about just tracking either the "Group" or "Not Group" (which ever has fewer codes) customer numbers. You could then load the data from Excel and apply a map to the User_Cust_Code field which would give you your "Grouped_Users". I have attached examples.