Sub Test()
Dim oRng As Word.Range
Set oRng = ActiveDocument.Content
With oRng.Find
.ClearFormatting
.Replacement.ClearFormatting
.Text = "^m"
.Wrap = wdFindStop
While .Execute
If oRng.Paragraphs(1).Style = "Heading 2" Or _
oRng.Paragraphs(1).Style = "Heading 3" Then
oRng.Delete
Else
oRng.Collapse wdCollapseEnd
End If
Wend
End With
End Sub