Can I create a coupon for a specific product?
Click on "ECommerce Settings" from the "Settings" tab found in the main navigation.
Then click on "Coupons" tab.
Then add a new "Coupon".
In the pop-up check "Should this coupon only apply to specific products or types?".
Then you will see a list of all the Types that are set to "Is ECommerce"
Click on the "+" to add the entire Type, and every Instance in the Type will be applied to the Coupon Code
Or Click on the Type's name and click on the Instance and/or SKU you wish to add the Coupon Code to.
Select as many as necessary and press "Update" found on the bottom of the all the Types.
In the Coupons table you can see the new coupon code with the selected items.