The following will add the data and the number with a leading zero
Code:
Sub PrintJobs()
Dim i As Long, startnum As Long, lastnum As Long
Dim orng As Range
Set orng = ActiveDocument.SelectContentControlsByTitle("Serialnumber").Item(1).Range
startnum = InputBox("Enter the first job number to be printed", "Print Job Number", 1)
lastnum = InputBox("Enter the last job number to be printed", "Print Job Number", 1)
For i = startnum To lastnum
orng.Text = Format(Date, "mmyy") & Format(i, "00")
ActiveDocument.PrintOut
Next
Set orng = Nothing
End Sub
Put the button on the QAT (Quick Access Toolbar) or on the ribbon
Customize the Office Ribbon (It doesn't take rocket science)