Extract from Archives for Movement only

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As I navigate the minefield of vintage Omegas, I was curious as to whether the archives will do an extract for just a movement. I have seen sellers on OF selling movements with an extract so I checked the 'Order an Extract' page and it looks like you have to upload photos of the the watch so that they can confirm everything matches.

Are people getting extracts just for movements for valuing or other reasons, or are they parting out a watch and just selling the movement with the extract? Still learning and trying to work out when a watch is made of parts or original. I had hoped an extract would be for complete watches.