Let's talk Supplemental Feeds! One of my biggest complaints about GMC Next (Google's latest Merchant Center UI) has been that it doesn't allow for supplemental feeds. We've been promised these, and so far nothing... that is until recently, when they quietly rolled out support for supplemental data sources (remember, that's what they call feeds now cause Google has to rebrand everything...). You can see a video walkthrough on how to enable those here: 

Or follow the instructions here: https://support.google.com/merchants/answer/14989391

Special thanks to Mike Ryan of SMEC for pointing me in the right direction here!

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Supplemental Data Sources Are Finally in Google Merchant Center Next (Here's How to Find Them)

If you've been following along with the Merchant Center Next rollout and feeling a low-grade anxiety about the absence of supplemental data feeds, I think you can breathe a little easier now, because Google has finally started rolling out supplemental data sources in individual accounts, and I want to make sure you know how to actually find them because the path there is not exactly obvious.

A quick hat tip to Mike Ryan, who flagged this to me and honestly deserves a lot of credit for consistently surfacing these kinds of updates before most of us have even thought to look for them. He keeps giving, and I keep appreciating it.

So here's the thing. If you go into your data sources and don't see a supplemental option, that's not a bug and you're not missing something obvious. You just haven't activated it yet. What you need to do is navigate to settings and tools, select add-ons, find the Discover tab, and then activate something called "Advanced Data Source Management." Once you've done that and gone back into your data sources, supplemental sources will appear, and you can add your supplemental product data feed from there.

I'll admit it took me a moment to find it the first time through, which I think says something about the intuitiveness of the interface, though I'll try not to belabor that particular point here.

Why does this matter? Well, if you've been reading our writing on Google Merchant Center for any length of time, you've probably seen us talk about supplemental feeds as one of the most important bulk editing tools available to anyone managing a large catalog. The ability to override or append feed data without touching the primary source is genuinely important, especially in situations where the dev team controls the main feed and the advertising team needs to make optimization changes independently. Losing that functionality in the transition to Merchant Center Next was, I think, one of the more legitimate concerns people had about the migration, so seeing it return is a meaningful step in the right direction.

One thing I want to flag, because Google's migration tools have historically been uneven in ways that have cost people real time and real money: if you're migrating a Classic Merchant Center account into Next, my assumption is that your existing supplemental feeds would carry over and show up within supplemental data sources, but I genuinely don't know that for certain yet, and I think it's worth verifying carefully rather than assuming. Google's auto-migration processes have surprised us before, and not always pleasantly.

For the broader context on why feed management matters so much to campaign strategy and performance, there's quite a bit on the blog worth exploring, but the short version is that bulk editing capability at the feed level is foundational to doing serious optimization work at scale, and its return to Merchant Center Next is genuinely good news worth knowing about.

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