Set Up "Complementary Products" Upsell

Log in to your PortalSphere Admin.
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In the left-hand sidebar, click Upsells and select Complementary Products from the two available options (Top Products or Complementary Products).

You’ll see a list of products that do not yet have complementary products assigned.
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Click on the product you want to assign a complementary item to.
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At the top of the page, click Assign Complementary Products to open the product selector.
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Scroll through the list or use the search bar to find the product you want to pair with the selected item.
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Click the product, then click Select in the bottom-right corner to assign it.