The Behavior Designer – Formations Pack includes 14 tasks focused on group formations. The default set of Formations Pack tasks use Unity’s navigation mesh to traverse the world. The Formations Pack doesn’t do the actual movement – it instead sets the destination for the underlying pathfinding implementation (Unity’s NavMesh, A* Pathfinding Project, etc).
You can download the Formations Pack integrations from this page. After you have imported an integration you can start to use the integration tasks by adding them to your behavior tree. For example, if you want to use the A* Pathfinding Project version of the grid task you would add the task located under Actions -> Formations -> A* Pathfinding Project -> Grid.