You can add a Logical People Group from the Outline View, and it will automatically be added as a Human Task Participant in the Participants View. For a key starting point to create Logical People Groups, see
Creating a Human Task Participant
Creating a Logical People Group From the Outline View:
From the Outline View, right mouse click on the process name.
Add > Human Interactions
Expand the Human Interactions element to see Logical People Groups.
Right mouse click on Logical People Groups and select
Add > Logical People Group
In the Properties view, fill in the definition as follows:
Type in a unique name, for example, "Regional Reps."
Add parameters as desired. A parameter can be used in an assign activity or a people query for LDAP or JDBC Identity services in the Process Deployment Descriptor file. Its value can further be expressed by an argument within the role assignment in a task definition. For example, potential owners from the "Northeast Region."
You can create Logical People Groups at the scope level for use within the enclosing scope.