You can apply [feed rules](https://support.google.com/merchants/answer/7450276) to
supplemental feeds to provide additional granularity for your product data
updates. Using feed rules with supplemental feeds gives you greater flexibility
and control over your product data. For example, you could create unique feed
rules to update your product data for your `price` supplemental feed, and
separate feed rules for your `availability` supplemental feed.

> [!NOTE]
> **Note:** You can only create feed rules in Merchant Center. It is not possible to create feed rules directly via the Content API.