on 26-10-2013 12:36 PM
on 26-10-2013 12:53 PM
It's a listing with multple variations.
For example, if you were to sell a T-Shirt then within the one listing the buyer can select colours (Blue, Green, Red) and/or sizes (Small, Large, Extra Large).
Instead of having a different listing for each colour and size.
on 26-10-2013 01:04 PM
There's info in the Seller Centre.
From the main menu top right of screen under Sell, select Seller Centre and scroll down until you find Multi-variation listings.