If you have checked off the setting "Use Event Assignment" for your event, then the Event Groups step will be added to your setup. This step allows you to create different Groups that you can then assign your purchasers to. For example, this group could be Teams, Tables, Families, etc. When setting up a Group you are able to input the following:
You are able to create as many groups as you need. They will then be available to you on the Event Assignments dashboard.