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.

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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