If you rely a lot on User As Group permissions to manage access to your content, you may want to set default permission rules so that whenever you enable that option at the user level, the required modules and rules are automatically applied.
To do so, you will require a template group, whose rules will be used as the template whenever a new user is enabled as User As Group.
Note that only the default rules will be applied. Custom permissions to content such as folders, databases or custom pages will need to be applied separately at the user level.
Permission Templates for Users As Group is set at the Division level (which means you can have a different template for each division).
To enable this option, go to Admin > Divisions, and then click on the division you would like to set a default permission template on. You can then select the template group within the dropdown against the Users as Group Default Rules field.