Hello @mvinkler and welcome to the customer community. Your GTINs are created based on the UPC for your consumer unit. To create the Each unit GTIN, you would simply add two zeroes to the beginning of your UPC. If you need to create other GTINs like Cases, different kinds of Cases and/or Innerpacks, Disdplay, and even pallets, you would do so by adding a 10, 20, 30 all the way up to 80 to the beginning of your UPC and also change your check digit. So if you have a Case of 4 eaches and a Case of 6 of the same Eaches, those Cases start with a different number.
You can learn more about these and other GTIN rules on the GS1 website https://www.gs1.org/gtinrules/.
