// GMC add-on setup guide

How to set up Advanced Data Source Management in Google Merchant Center

Advanced Data Source Management lets you patch missing product attributes without touching your primary feed. Use supplemental feeds to add GTIN, brand, custom labels, sale prices, or category overrides across thousands of products in minutes.

// Add-on
Advanced Data Source Management
// Impact
Fix feed gaps fast
// Setup time
7 steps · ~15-30 min
// Direct link
Open in GMC ↗

Requirements

  • ✓ Verified Merchant Center account
  • ✓ Primary feed already active
  • ✓ Clear list of attributes you want to add/override
  • ✓ Google Sheet, FTP-hosted file, or Content API access for feed delivery

Step-by-step setup

  1. 1
    Open Data sources
    Merchant Center → Settings → Data sources → click "Add data source".
  2. 2
    Choose feed type
    Pick "Supplemental" (not "Primary"). Give it a descriptive name like "GTIN patch" or "Custom labels".
  3. 3
    Pick delivery method
    Google Sheet (easiest), scheduled fetch (host XML/TSV on your server), or Content API (advanced).
  4. 4
    Map ID column
    The offer ID column MUST match the primary feed's id column. Wrong offer IDs = orphan rows.
  5. 5
    Add attribute columns
    Only include columns you want to add or override. Empty columns don't affect existing values.
  6. 6
    Set schedule + country/language
    Set delivery frequency (daily typical) + target country + language for the supplemental feed.
  7. 7
    Verify in Diagnostics
    Merchant Center → Products → click a product → check "Overrides applied" section.

Common issues + how to fix

⚠
ID column mismatch
Every supplemental row must have an offer ID that exists in the primary feed. Mismatches show as "unrecognized".
⚠
Wrong country/language
A US-targeted supplemental feed won't affect UK products. Match feed target exactly.
⚠
Case-sensitive attribute names
Column headers must match Google's spec exactly (e.g., google_product_category, not Google_Product_Category).

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