For plans, addons and charges there are options to define multiple price points as well as differential pricing in Product Catalog 2.0 whereas there are no such options for coupons. Especially when there is an existing coupon attached to some subscription but you want to change the discount amount/ duration/validity for new subscriptions then the clone coupon option is used.
Updates: With the recent update, the Coupon Details page is migrated from the default Classic UI to the Leap UI page. The new Leap UI Coupon Details page is designed to provide a more intuitive and efficient user experience, allowing you to easily view and manage coupon details. Refer to this link to know more about the new UI enhancements. Refer to this link for more information.
You can clone the coupon by following the steps given below
Step 1: Go to Product Catalog -> Coupon
Step 2: Open the coupon to be cloned and click on the 'Clone coupon' button
Step 3: Enter the details of the coupon that needs to be edited and click on 'Save and create'. The cloned coupon is created.