What are the ways to submit custom attributes in my Google feed?

If you have more fields in your store catalog, you can output them to your data feed by adding Catalog Fields from the Manage Feed > Define Fields page. Refer to Defining your Custom Attributes for details on how to name the attributes in the feed.

The values in the above field types are passed through directly without any changes. If you need special handling, consider upgrading to a Custom data feed. We have customizable field types that can do things such as remove HTML tags, remove boilerplate text, and re-categorize products.