Facebook allow merchants to submit supplemental feeds to update (supplementary feed) product data to items created by primary feeds in the Catalogue.
This template file specifies which columns to be included in the generated feed file, and can be retrieved using the "Build Template" feature in Commerce Manager.
These are the steps to generate a supplementary feed template:
Go to Commerce Manager and select your catalogue.
Open the Catalogue tab and go to Data sources.
In the supplementary feed section, click "add new feed"
Click "build template"
Select the product category that suits the products included in feed. Each categories has its set of fields (item attributes) that need to be filled in. Select Next.
Click "Download CSV template"
You can then use the downloaded template file to create the feed in the app.
