In a Microsoft Advertising shopping campaign, a product group is a collection of products in your inventory feed that match criteria you specify.
Only products defined in your Microsoft Merchant Center store can be included in a product group. To avoid sync errors or inconsistent reporting, use a single inventory feed to provide data for both your Microsoft Merchant Center store and your Google Merchant Center account.
Merchant Center accounts in the previous Search Ads 360 are automatically available in the new Search Ads 360. Link your Microsoft Merchant Center store with Search Ads 360
Learn more about managing product groups in a Microsoft Advertising shopping campaign in the Microsoft Advertising Help Center.