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There are a number of ways to import product information into your storefront. Unfortunately, there is no way to import that information directly into Shopping Feed. Find your platform to learn more about importing product data for your use.
For fields that exist in Shopify already (like price, description, etc)
For Shopify, you can download your products to a .CSV file, paste in product data directly into the file using your favorite spreadsheet, then upload the same file after saving.
To create a new custom field for your products.
Shopify supports Metafields natively. Metafields are custom fields where you or an app can store product information. A number of Apps in Shopify rely on Metafields for their basic functions.
If you want to manually input data into Metafields, we recommend using MetaFields Editor, a free solution.
If you are trying to import data into metafields, we recommend using MetaFields Pro
In Prestashop, you can assign features to your product catalog. A new feature will create a field, which is imported into Shopping Feed. Once added, these features are configurable for each product in your catalog, and can be set with a default value
In Magento, adding an attribute is essentially adding a field to store data for each of your product. Check out more on how to create a custom attribute. You can import product data into your custom attributes using a number of tools like this one