Using the Base Promotion List
When you create a new catalog, a new Base Promotion List is created automatically. You cannot control the eligibility or add any price modifiers for a base promotion list. You can only use it to add specific entries that you want to target with a promotional price.
To use the base promotion list,
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Open the Global Menu (  ) and go to Commerce → Catalogs. ) and go to Commerce → Catalogs. 
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Click Add (  ) and enter the following information. ) and enter the following information.Name: Test Catalog Default Catalog Language: English (United States) Currency: US Dollar  
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Click Submit. 
This creates a new catalog and a new base promotion list. To view this, open the Global Menu ( ) and click on Commerce → Promotions. You should see a new entry as Test Catalog Base Promotion.
) and click on Commerce → Promotions. You should see a new entry as Test Catalog Base Promotion.
Adding Entries
The base promotion list automatically adds all products in the corresponding catalog as entries. To target a specific SKU in the Catalog,
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Search for an SKU in the Entries section and click on it. 
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You can enter a promotion price, expiration date, and configure bulk or tiered pricing for the SKU.  
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Click Save. 
You can also use the Override Discount toggle to give the promotion price precedence over any active discounts. See the comparison between a promotion overriding a 20% discount and without it.

Setting a SKU’s price to 0 in a promotion list specifies the absence of a promotion price.
Another way to target an SKU with a promotion price is by opening the Global Menu ( ) and going to Commerce → Products. Find and select the product and click the SKUs tab. Select the SKU you want to target and set a promotion price for it. Click Publish. This sets the price of the SKU in the Base Promotion List. Before Liferay DXP 7.4 U42/GA42, promotion price was called sale price.
) and going to Commerce → Products. Find and select the product and click the SKUs tab. Select the SKU you want to target and set a promotion price for it. Click Publish. This sets the price of the SKU in the Base Promotion List. Before Liferay DXP 7.4 U42/GA42, promotion price was called sale price.