Google Ads Merchant Center: How to upload supplemental product label feed

A supplemental feed is a secondary data source used to provide more details or update existing details, such as required or optional product attributes, that may be missing from your primary feed. 

Guide: How to insert a supplemental feed in your Google Merchant Center:

Step 1 – Login to Google Merchant Center and Navigate to the Feed overview

Click Products in the left hand menu, then click Feeds.

This will show you an overview of all the feeds associated with this GMC account.

On the bottom half of the page, you will see the Supplemental feeds section.

There, click “Add supplemental feed”.

Step 2 – Add a name for the supplemental feed

First, add a name for your feed. Make sure it’s descriptive of which feed you want to update, and what attributed you’re planning on changes.

For example: "Reaktion-hero-feed"

Step 3 – Choose the input method

Select "Scheduled Fetch"

Step 4 – Fetch the feed every night at 3 am