When grouping columns, SummaryColumns determines where the summary columns for the groups are located. By default the summary rows are located to the right of the groupings.

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 public SummaryColumnsLocation SummaryColumns{ get; set; }
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<p>Public Property SummaryColumns() As SummaryColumnsLocation</p>

          //--- Get SummaryColumns
          Worksheet.SummaryColumnsLocation location = ws.SummaryColumns;

          //--- Set SummaryColumns
          ws.SummaryColumns = Worksheet.SummaryColumnsLocation.Left;
        

          '--- Get SummaryColumns
          Dim location As Worksheet.SummaryColumnsLocation = ws.SummaryColumns

          '--- Set SummaryColumns
          ws.SummaryColumns = Worksheet.SummaryColumnsLocation.Left