diff --git a/Examples/Subtotals.ps1 b/Examples/Subtotals.ps1
new file mode 100644
index 0000000..24692ca
--- /dev/null
+++ b/Examples/Subtotals.ps1
@@ -0,0 +1,62 @@
+$excelpath          = "$env:temp\subtotal.xlsx"
+$SheetName          = 'Sheet1'
+$SubtotalFieldName  = 'Net'
+$GroupByFieldName   = 'City'
+$SubtotalFormula    = '=SUBTOTAL(3,D{0}:D{1})'  # {0} and {1} are placeholders for the first and last row. D is the column to total in
+                       # 1=AVERAGE;  2=COUNT; 3=COUNTA; 4=MAX; 5=MIN; 6=PRODUCT; 7=STDEV; 8=STDEVP; 9=SUM; 10=VAR; 11=VARP add 100 to ignore hidden values
+
+Remove-Item -Path $excelpath -ErrorAction SilentlyContinue
+
+$Data  =  ConvertFrom-Csv    @'
+Product, City, Gross, Net
+Apple, London , 300, 250
+Orange, London , 400, 350
+Banana, London , 300, 200
+Orange, Paris,   600, 500
+Banana, Paris,   300, 200
+Apple, New York, 1200,700
+'@
+
+#at each change in the Group by field, insert a subtotal (count) formula in the title column & send to excel - list those rows and make them half height after export
+$currentRow         = 2
+$lastChangeRow      = 2
+$insertedRows       = @()
+$hideRows           = @()
+$lastValue          = $Data[0].$GroupByFieldName
+$excel              = $Data  | ForEach-Object -Process {
+    if ($_.$GroupByFieldName -ne $lastvalue) {
+        $Formula    = $SubtotalFormula -f $lastChangeRow, ($currentrow - 1)
+        if ($lastChangeRow -eq ($currentrow - 1)) {$hideRows     += $CurrentRow }
+        else                                      {$insertedRows += $CurrentRow }
+        [pscustomobject]@{$SubtotalFieldName=$Formula}
+        $currentRow   += 1
+        $lastChangeRow = $currentRow
+        $lastValue     = $_.$GroupByFieldName
+    }
+    $_
+    $currentRow += 1
+} -end {
+    $Formula = $SubtotalFormula -f $lastChangeRow, ($currentrow - 1)
+    [pscustomobject]@{$SubtotalFieldName=$Formula}
+} | Export-Excel  -Path $excelpath -PassThru  -AutoSize -AutoFilter -BoldTopRow -WorksheetName $SheetName
+
+#We kept a lists of the total rows Since 1 rows won't get expand/collapse hide them.
+#foreach ($r in $insertedrows)  { $excel.WorkItems.Row($r).Height = 8}
+foreach ($r in $hideRows)      { $excel.$SheetName.Row($r).hidden = $true}
+$range      = $excel.$SheetName.Dimension.Address
+$SheetIndex = $excel.Sheet1.Index
+Close-ExcelPackage -ExcelPackage $excel
+
+try   { $excelApp      = New-Object -ComObject "Excel.Application" }
+catch { Write-Warning "Could not start Excel application - which usually means it is not installed."  ; return }
+
+try   { $excelWorkBook = $excelApp.Workbooks.Open($excelpath) }
+catch { Write-Warning -Message "Could not Open $excelpath."  ; return }
+$ws   = $excelWorkBook.Worksheets.Item($SheetIndex)
+$null = $ws.Range($range).Select()
+$null = $excelapp.Selection.AutoOutline()
+$excelWorkBook.Save()
+$excelWorkBook.Close()
+$excelApp.Quit()
+
+Start $excelpath
\ No newline at end of file