When we rolled out the new website months ago, the edit quantity and "sell in multiples of..." functions were temporarily disabled. That function is available again! If you edit the listing, you should see a drop down to be able to edit the quantity or how many tickets you would like to sell together.
Say you have 5 tickets to sell, then you change quantity to 2, then you sell the two, is the listing now gone? deactivated?
you would have 1 ticket left.In regards to the first question. I believe if you have 4 tickets listed for example and decide you want to keep 2 you would have to delete the listing and repost