Defining Feeds
You must create feeds for the costPrice and returnRate attributes if you want to use all the system attributes calculated for ProductActiveData.
You can optionally feed in values for the availableDate attribute. If you don't feed in the availableDate, Salesforce B2C Commerce uses the creationDate attribute instead. The system created this attribute when you added a product. If you create additional custom active data attributes, you must feed those in as well.
You might want to create different feeds if the attributes you are importing need to be imported with a different frequency (daily versus weekly) or if they are being fed from different backend systems. You can create a maximum of three feed definitions.
As a next step, you need to create the feed files that use this definition to import
values for the attributes.