It  is part of the new Promotions Manager package, go to Manage My Store, and under Marketing Tools/Item Promotion you will see Promotions Manager.  You can use this to set up all sorts of Promotions that will place that sort of banner on your eligible listings.

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@destinationhome wrote:

 

 

I tried using Ebays promotional postage rules, but that only gives an option to use the promotion on all your items with combined postage discounts. I only want to use it for select items.

 

 

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The promotional postage rule can be applied to selected items - eBay state something along the lines that it will apply to all current and future listings, but that's basically a lie. 😄

You can see from this screenshot, from one of my own listings, that the promotional postage rule is not selected.

Once you have created a promotional postage rule, and ensured it is only applied to the listings you want it to be, eBay will automatically group the items and show the banner on your listings.