To make purchase quantity rules available for your store’s products, add the Quantity
Rule related list to the Product object’s page layout.
Required Editions
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Click
at the top of the page, then select Setup.
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Select Object Manager, and in the Quick Find box, find and select
Product.
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From the navigation sidebar, select Page Layouts, and then
select Commerce Product Layout.
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From the Commerce Product Layout menu, select Related Lists, and
drag the Quantity Rules related list to the page layout.
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Save your changes.
After you enable purchase quantity rules, create and assign them to simple products and product variations.