I don't know whether this will work on a Mac but there is a very old WordBasic command that removes the manual numbering. Try this macro on your selected text in your file
Code:
'====================================================
Sub NumberingDeleteHardcoded()
'Only acts on selected paragraphs
Dim iResp As Integer
iResp = MsgBox("This macro will remove all hardcoded paragraph numbers " _
& vbCr & "from the SELECTED paragraphs. Click OK to continue.", _
vbOKCancel, "Delete Hard Numbers")
If iResp = vbOK Then
WordBasic.ToolsBulletsNumbers Replace:=0, Type:=1, Remove:=1
End If
End Sub