[SYS] Workflow Notification to a Group of People

You can achieve that using Role.

Login using SYSADMIN account.

Navigate User Management-> Roles & Role Inheritance to create Role.

Assign Role to User, navigate User Management->Users.

SQL: SELECT * FROM WF_USER_ROLES WHERE role_name= 'MyRole';

In your custom Workflow, notification can be sent to group of people that was assigned with this role. But this will make the notification appears in their Notification Summary, but no email will be sent. Further touch up to send email is needed in the workflow.

Thanks Herman Surya for his valuable input.