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Feature introduced in Pipeline 6.2
There are two product metafields definitions required to connect each of the products together and generate linked swatches.
Using the Shopify Admin, choose Settings -> Custom data -> Products
Both metafields will be defined under the category of Products
Choose the Add definition button. If this is your first time creating a metafield, the options may look similar to this, simply click on one of the Add definition buttons:
Next, create these two metafields: