Originally Posted by CliffordK

I assume that means 2 shifters & 2 derailleurs.

Maybe Chain/Cassette/Brake Calipers/Crankset.

Probably not wheels, bars, seatpost, stem, pedals, etc.

I assume the 9000 is one generation back, 11s. I don't buy a lot of Dura Ace, but that should still bring reasonably competitive prices.

That could go either way. I see quite a few mini-groups listed, and they seem to do reasonably well. Personally, I tend to buy more Campagnolo, and tend to find prices coming pretty close either way. Sometimes I think I get a better deal buying individual components (sometimes buying an entire groupset as individual parts from the same seller).

If you sell as a group, make sure the first photo shows everything, then do individual photos of each part, as well as listing every part in the description.

If you sell individually, put a note in your add "See other listings for more of the groupset".