Document.TrackMoves (Word)

Returns or sets a Boolean that represents whether to mark moved text when Track Changes is turned on.

By default, when Track Changes is turned on, moved text is marked as deleted and inserted. When TrackMoves is True, moved text is marked as moved, with the from text being marked with strikethrough formatting. This property corresponds to the Track Moves check box in the Track Change Options dialog box.

ActiveDocument.TrackMoves = True