1. In the administration panel, go to Marketing > Promotions.
2. Click the + button on the left and choose Add catalog promotion.
3. On the opened page, complete the information under the General section.
4. In the Conditions tab, click the Add condition button.
5. In the opened drop-down list box, select Categories. Then select in or not in, click the Add categories button and add categories which products will have a discount.
   

   
   
   

6. In the Bonuses tab, click the Add bonus button.
7. In the opened drop-down list box, select the necessary option. Then specify the necessary value in the opened input box.
8. Click the Save button.