I looked here: https://confluence.atlassian.com/servicedeskcloud/managing-service-desk-notifications-732528936.html
and it appears I should be able to do this no problem. The client has provided two lists of customers.
- List A is a sub-set of List B.
- List A members receive notifications on any issues created/resolved.
- List B members receive notifications for their own issues.
I created two organizations, call them List A & List B. In the Customer Notifications you can edit a notification and there's a To: field.
The only values I can get in there are Customers Involved and Reporter (Customer).
What I want to see is List A.

From help link above. No difference if I create a custom notification.
