Managers and administrators are added in the same way employees are added - via "Employees" > "Add employees".
Once added as employees, you'll need to upgrade the permissions on their profile to give them the ability to add and edit your schedules. To update their permissions, click on the profile and click "Permissions" at the bottom.
Aside from upgrading their permissions, you may also want to remove this manager from the schedule by unticking "Display on schedule". You can also hide them from other employees by unticking "Show to other employees".
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