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 can be linked to Search Ads 360. Set up and add your Microsoft Merchant Center store to Search Ads 360.
Learn more about managing product groups in a Microsoft Advertising shopping campaign in the Microsoft Advertising Help Center.