Two different kinds of groups can be created within 360Alumni's platform: Dynamic and Regular Groups.
Dynamic Groups are an attractive option because they're automatically populated based on your Association Field 1 value. For more information on association fields, click here. Regular Groups are used because community directors can populate them manually adding or inviting members. Once the group is created, you cannot change your selection.
Note that only Administrators have the permission to create a Dynamic Group.
Follow the steps from the "Create a Group" article to finish creating a Dynamic Group.