Sub LetterIncrement()
' Paul Beverley - Version 26.04.16
' Find next alpha character and decrement it alphabetically

doTrack = False

myTrack = ActiveDocument.TrackRevisions
If doTrack = False Then ActiveDocument.TrackRevisions = False
Selection.Collapse wdCollapseStart
Do While UCase(ChrW(AscW(Selection))) = LCase(ChrW(AscW(Selection)))
  Selection.MoveRight , 1
  DoEvents
Loop
Selection.End = Selection.Start + 1
Selection.TypeText Text:=ChrW(AscW(Selection) + 1)
Selection.MoveLeft , 1
ActiveDocument.TrackRevisions = myTrack
End Sub