Replacing Managers (Direct Reports)

The first is by Editing the Employee Profile and selecting the new manager from the Manager drop-down field:

The other method (which works well for a bulk change) is by clicking "View" on the existing manager's employee profile, then going to the Direct Reports tab. 

You are able to see a snippet of the company org chart here, broken down for this specific manager. You can hover over each employee's name to display basic employee information. 

If you click on the 'Replace Managers' button in the top right hand corner, you will be taken to a new screen where you are able to select a new manager for the employees that report to this person:

From here, you are able to select the new manager either for each individual employee, or you can change the first listed employee, then click "Copy First Manager to all" to change over all employees to the new manager. 

You can also mark 'Temporary Manager' if you need an employee to report to a new manager for a temporary period of time. Simply check the 'Temporary Manager' box and then fill in the designated time period. This works well for when a manager goes on leave. The change will revert back to the current manager once the set time period is complete.