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Go to Dashboard-> Pricing rules-> Add new rules.
Create a new BOGO rule as below.
Discount Type: Buy X Get X
Under Bogo Options, Select Bogo Type as Buy X get discount on nth item. Choose the Product Soap, Offer Count 3, Discount Type Free. Add Offer Description Buy 3 and Get 1 Free. Then Save the Rule.
1) Select the product Soap and change the quantity to 3.
2) Now add this product to the cart.
3) You can see the discount applied in the cart as below.