Private Sub Workbook_BeforePrint(Cancel As Boolean)
   With ActiveSheet
       If .Name = "Sheet1" Then
           .PageSetup.LeftFooter -.Range("A1").Text
       End If
   End With
End Sub

'This is workbook event code.
'To input this code, right click on the Excel icon on the worksheet
'(or next to the File menu if you maximise your workbooks),
'select View Code from the menu, and paste the code