You can select one or multiple Groups for your customers to receive the notifications.
Only jobs belonging to the related Group will receive the notification according to the setup.
Steps
Navigate to Users > Groups.
Click on the “Add Group” button to add some Groups.
The above will allow you to tag a job to a group.
Navigate to Settings > Notification > Notification Settings
Whenever you add or edit the notification, you may select multiple Groups for the notification.