This example enables line numbering for the active document. The starting number is set to 1, and the numbering is continuous throughout all sections in the document. Line numbering is then repressed for the second paragraph.
With ActiveDocument.PageSetup.LineNumbering
.Active = True
.StartingNumber = 1
.CountBy = 1
.RestartMode = wdRestartContinuous
End With
ActiveDocument.Paragraphs(2).NoLineNumber = True