Starting with v2.1 of the Content API, you can use
[supplemental feeds](https://support.google.com/merchants/answer/7439058#supplemental)
to perform partial updates of product data. Partial updates with supplemental
feeds let you make requests that only include the fields that you want to
modify, without affecting the rest of the product data. Once you create your
supplemental feeds in Merchant Center, you can make partial updates by including
the `feedId` query parameter when calling `Products.insert` and
`Products.delete`.

> [!IMPORTANT]
> **Key Point:** Partial updates with supplemental feeds do not reset the product expiration date. Submit a full `Products.insert` request to [reset the product
> expiration date](https://developers.google.com/shopping-content/guides/best-practices#update-items-before-they-expire).

> [!NOTE]
> **Note:** You can only use supplemental feeds to update existing products. You cannot create new products with supplemental feed requests.