Specifying Column Sort Order in Reporting

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Does anyone know of a way to specify the order in which you would like columns to sort within a report?  In my example, I have created a report that has multiple columns, but I would like to sort by Requisition Number, then Candidate Name, and then do a custom sort on the App. Current CSW Step (the columns are included in the report in that order as well).  However, it appears that report is applying the custom sort first.  I can't find anything in the documentation to determine how to do this, so I'm hoping others out there have