Step 1 - Open your store's Discounts page and click Create discount

Step 2 - Scroll down to the Discount Kit section, which should now be available, and click Product volume

Step 3 - Fill in the desired settings and click Save. For detailed information on available settings, click here.

Product Volume Table - Head to your theme editor and then to the product page. On the left-hand side, click Add block to add the Product Volume Table.
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This is a purely informational component that informs customers of an available discount as well as where they sit within that discount for the current page's product.

Bundle Selector - As above, on the product page in your theme editor, click Add block and select the Bundle Selector from available app blocks.

This component gives customers the ability to quickly add a selection of products to satisfy an available discount. For the sake of clarity, it could be best to create a product page specific to products with discounts and remove the default variant picker and quantity selector components for that page. The Bundle Selector will handle all of that for you!