True if the range is an outlining summary row or column. The range should be a row or a column. Read-only Variant .
expression . Summary
expression A variable that represents a Range object.
This example formats row four on Sheet1 as bold and italic if it's an outlining summary column.
With Worksheets("Sheet1").Rows(4)
If .Summary = True Then
.Font.Bold = True
.Font.Italic = True
End If
End With