Alternate method is a macro
Sub Cubic_Meters()
Selection.NumberFormat = "0"" m" & Chr(179) & """"
End Sub
Select the number cells and run the macro.
Or sheet event code for automatic when hit Enter key after input
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Column > 3 Then Exit Sub 'limited to columns A:C
With Target
.NumberFormat = "0"" m" & Chr(179) & """"
End With
End Sub
Gord