I'm not totally sure what you're asking, but I would check the readme first on how you are able to distribute the merchant resource as your own morph or contact the vendor. If the license says that in order to distribute the new morph you would combine them into a single morph with a new name, you would need to name the eye morph that you changed to match the name of the morph that you are going to distribute, with the property group the same. 

So if you have a morph named "MyHeadMorph" in "Actor/Head/People/Masculine", you would name your eye morph "MyHeadMorph" and set the property group as "Actor/Head/People/Masculine". So when you set the dial in Genesis 9, the eye morph will automatically dial up.