Sync Inventory Stock for variants with the same SKU using Shopify Flow

Shopify Plus

Topic summary

Goal: automatically sync inventory across variants that share the same SKU using Shopify Flow.

Current capability: Flow can trigger on “Inventory quantity changed,” but it does not have a native action to update stock levels on product variants. Implementing this end-to-end in Flow would require a Partner app that exposes a Flow Action (via a Flow Action App Extension) to perform the inventory update.

Desired logic (from OP): (1) On any inventory change, (2) find all variants with the same SKU, (3) set their quantities to match the updated item. Flow cannot complete step (3) natively today.

Workarounds suggested:

  • Third‑party apps: Duplicate SKU Sync (already used by OP) and Stocklink were recommended to auto-sync stock.
  • Shopify Bundles (free Shopify app) was mentioned, though it primarily addresses bundle relationships rather than same‑SKU syncing.

Community feedback: A request was made for Shopify to add a Flow action to update inventory, noting reliance on third‑party apps for this common need.

Status: No native Flow-only solution; use a compatible app or partner action. Discussion remains open with an outstanding feature request.

Summarized with AI on December 18. AI used: gpt-5.
1

Hi,

Does anyone know how to use Shopify Flow to Sync Stock for variants with the same SKU across all my inventory?
I know there are some apps doing this. But I wonder if Shopify Flow could do the same.

Thanks!

2

Hi @J-P-M ,

It’s hard to say definitively without knowing much more about your exact use case, but Flow does have an ‘Inventory Quantity Changed’ workflow trigger that you can use to build workflows that could pull inventory data into another Partner App (via Flow Action App Extension).

3

Hi @joshbeckman ,

Sorry I didn’t explain in detail. I’m trying to find a flow that (1) when there is a change in the inventory qty for any reason, (2) the flow will check all SKU in my store and if it finds any variation with the same SKU (3) it will update these other variations with the same qty stock as the first one.

I’ve used this app for a while (https://apps.shopify.com/duplicate-sku-sync)) it does this task, but I wonder if Shopify Flow can do the same.

1 Like
4

@J-P-M Unfortunately, Flow currently does not have an action to update stock levels on product variants. But another partner app may expose a Flow Partner action to do this.

5

Thank you @joshbeckman

6

Stocklink is a simple solution to sync inventories between products.

We’ve found it to be the best solution for stores that need to auto-update inventories based on product sales.

https://apps.shopify.com/stocklink

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7

Consider us to be requesting this flow action, having to use yet another third party app for this minor-but-important action seems excessive

8

You can try out bundle app. Check out Free app made by Shopify https://apps.shopify.com/shopify-bundles.

1 Like