I mentioned in other threads and requested this feature by emailing PriceCharting directly (no response).

Yes, there should be an option in the collection tractor to mark an item as "Sold" if I sell an item in my collection to a friend, TCG shop, or convention. It will make tracking my collection's P&L much more accurate. I've been putting my sold items in a separate box and commenting "sold [price sold]." 

Yes, there should be an option in the collection tractor to mark an item as "Sold" if I sold an item in my collection to a friend, TCG shop, or convention. It will make tracking my collection's P&L much more accurate.