If you want to show an upsell only when the customer has used a specific coupon code at the checkout, then you can do that.
Step 1: Select ‘Coupons’ from the Advanced Rules Tab
Next, specify the coupon code.
Type in the characters of the coupon code and select the right one from the drop-down.
You can add multiple coupons here as per your requirements.
Step 3: Hit the ‘Save Settings’ button
Once done, click on the ‘Save Settings’ button to save your changes.
There you go!
So when a user purchases using the specified coupon code – they will be shown that upsell funnel.