A word document doesn't consist of rows unless it is a table. Perhaps something like this:
Sub ScratchMacro()
'A basic Word macro coded by Greg Maxey
Dim oRng As Range
Set oRng = ActiveDocument.Range
oRng.Collapse wdCollapseStart
Do
oRng.Select
oRng.End = oRng.End + 20
If InStr(oRng, Chr(13)) > 0 Then
oRng.Start = InStr(oRng, Chr(13))
oRng.End = oRng.Start
Else
oRng.Start = oRng.End
oRng.InsertBefore vbCr
oRng.Start = oRng.Start + 1
End If
Loop Until ActiveDocument.Range.End - oRng.End < 20
lbl_Exit:
Exit Sub
End Sub