Option Explicit

Private Sub Document_New()
    AddProp "APS_ContractNumber", False, 4, "[Contract Number]"
    AddProp "APS_DocumentCode", False, 4, "[Document Code]"
    AddProp "APS_DocumentNumber", False, 4, "[Document Number]"
    AddProp "APS_DocumentTitle", False, 4, "[Document Title]"
    AddProp "APS_DocumentType", False, 4, "[Document Type]"
    AddProp "APS_Revision", False, 4, "[RR]"
    AddProp "APS_RevisionDate", False, 3, "01/01/2000"
    AddProp "APS_SubjectCode", False, 4, "[Subject Code]"
    AddProp "APS_UniqueIdentifier", False, 4, "[XXX]"
End Sub

Private Sub AddProp(sName As String, bLink As Boolean, lType As Long, sValue As String)
Dim oProp As DocumentProperty
    With ActiveDocument
        For Each oProp In .CustomDocumentProperties
            If oProp.Name = sName Then
                oProp.Value = sValue
                GoTo lbl_Exit
            End If
        Next oProp
        .CustomDocumentProperties.Add _
                Name:=sName, _
                LinkToContent:=bLink, _
                Type:=lType, _
                Value:=sValue
    End With
lbl_Exit:
    Set oProp = Nothing
    Exit Sub
End Sub