You can define rules to automatically add user accounts to a user-defined subclient.
Based on the method that you selected while enabling the auto discovery of user accounts for the app, you can define rules:
If you selected Match user name by regular expressions to add the user accounts that match the regular expression, see Adding User Accounts That Match Regular Expressions.
If you selected Google user group affinity to add the user accounts that are part of a sub organization created on Google, see Adding User Accounts from a Google Sub Organization.