Starting with callout extensions, advertisers will be able to associate account-level ad extensions in Editor as shown in the screen shot below.
Bing Ads Editor will support account-level ad extensions.
You’ll need to select the account level in the navigation in the upper right to access account-level extensions. And, as with shared library updates, account level ad extension associations are always posted, regardless of whether all campaigns or selected campaigns are being posted.
Support for other extensions at the account level will be rolling out in the near future.
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