Using Discount Levels
You can create discount levels to apply multiple discounts to products and orders. Commerce applies these discounts consecutively according to their rank. For example, if you create a level 1 discount offering 20% off and a level 2 discount offering an additional 5% off if the cart value exceeds 50$, the level 1 discount is applied first, and if applicable, the level two discount is applied second.
To add discount levels on a Minium site,
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Open the Global Menu (  ) and navigate to Commerce → Discounts. ) and navigate to Commerce → Discounts. 
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Click Add (  ) and enter this information: ) and enter this information:Name: U-Joint Clearance Type: Percentage Apply To: Products 
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Click Submit. This opens a new page with options to configure the discount. 
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Enter 20 for the Amount and keep the default Level value (L1).  
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In the Products section, search for U-Joint and click Select. 
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Toggle the Active switch to enable the discount. 
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Click Publish. This creates the base discount of 20% for the product (U-Joint). 
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Return to the Discounts application page and repeat steps 2-3 to create another discount with a different name. 
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Enter 5 for the Amount and set the Level to L2. 
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In the Products section, search for U-Joint and click Select. 
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In the Rules section, click Add (  ) and enter this information: ) and enter this information:Name: Cart Total Exceeds $50 Type: Cart Total 
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Click Submit. 
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Edit the rule, enter 50 for the Cart Total Minimum Amount, and click Save.  
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Click Publish. 
Go to your site and open the product page for u-joint. It should have a base discount of 20% off. Then add more units to your cart, so the total exceeds $50. Check the price again to verify the additional discount is applied to your cart.

Overriding discounts for a price entry overrides all discount levels targeting the SKU. See Overriding Discounts for more information.