If you need to add a person on to the system but they aren't being paid by the organisation you can do this by adding them as a user. This will mean that they will not have an employment so will not be able to have any one report into them.
They can be assigned roles and permission for access to areas of the system as an employee would.
Click Users section in the system, usually under the Configuration tab.
Click Add User and here enter details such as forename, surname, username and password.
Once the user is created, click back into the user and set their roles and Permissions here to give certain levels of access.
You may need to enable the brand to enable the user to be added, if this comes up as an error please update as per below steps:
Click System Settings then click Settings.
Click on Field settings then search for Brand in the search field.
Click into the setting and select from the drop-down option Mandatory.