Within Teamwork Projects, you can create a role within a project as a way to group people together.
You can then use a role to mention that group of people easily in a comment, message, or assign a task to all of them at once.
To assign a group of users to a particular task, mention the role in the task name (@role) to assign the users within that role.
Note: When a role is used to assign a task to a group of people, the users are then assigned directly and the reference to the role itself is removed.
For more information see: Creating and editing roles on a project