If you need different items to close separately from the main auction end time you have flexibility to make those changes. You can assign different items to preferred time blocks.
First you want to create any additional time blocks.
1) Click "Auctions" > Click on "Manage Auctions".
2) Click on the Name of your auction.
3) Click "EDIT SETTINGS"
4) Click one of the existing time blocks or click "Add new Time".
5) Once your Time block has been created, go to "Items" > All Items. Click on the Blue Pencil to Edit your item.
6) Find the Auction time section and click on the time block you wish to assign the item.