Primary and supplemental feeds can be linked together using the ID attribute using feed rules in Merchant Center. This way, they will only update product data when the ID matches a value that exists in the primary feed, as long as you include product data for each ID in the primary feed. What can supplemental feed be used for? Supplementary feeds are secondary data sources that provide additional attributes (required and optional) that may be missing from your main feed. Uses for supplemental feeds include: Adding country- and language-specific product data.
Add or override custom labels for campaign management Add or override promotion IDs for retail promotions Override headers Exclude specific products (via exclude_destination attribute) Add missing GTINs Add local inventory information for Fax List local inventory ads [ID] attribute column, and at least one additional column containing the data you want to connect to the primary feed. How to Create a Supplemental Feed Creating a supplemental feed in Merchant Center is easy. All you need to do is: Go to the product page in Merchant Center and click the Add Supplemental Feed button above the table.
Follow the prompts and provide the following information about your data: Supplemental Feed Name: Enter a descriptive name that will help you identify your supplemental feed. Determine your input method: Choose the input method that best suits your needs: Google Sheets: Send us your data using a generated Google Sheets template or an existing Google Sheet that contains your product data. Scheduled Fetch: Google can fetch your feed directly from your server. Upload: Upload files directly to Merchant Center via SFTP, FTP, Google Cloud Storage, or manually. File name.