Please follow the steps for create discounts

Login to back-office > from the left menu go to ‘MARKETING’ > select ‘Discounts & Offers’ tab > click on ‘New Campaign’ button > add below mandatory details

Campaign Name

Select Shop

Select Order Type

Select Start Date & Time and End Date & Time

Select Discounts Type (Flat Offer on Items) for Giving Discounts for Item

Enter Discounts value in Percentage

Minimum Order Value

Select Category of Item

Select Item on which you want to give discounts

Enter Minimum Item Purchase

Tick on Apply per Item and Auto Apply

Click on Save Campaign