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The managers assigned place within the organizations hierarchy. This value is applied only when Hierarchical Groups are enabled. See Reporting Groups document for more information.
Manager Alerts
The Manager Alerts configured on the Managers page (as opposed to Global Email Alerts) will filter alerts to only those received from Drivers and Vehicles which are under the Mangers Hierarchy or Reporting Group
These alerts are configured on a per-manager basis and accessible by clicking the + sign to the left of each managers record