You can add new absence reasons, if you follow the below steps:
Go to Settings, you can usually find this under Configuration or Admin Menu depending on your software configuration.
Click Module Settings and select HR.
Select the relevant Absence Reason.
Click Add Absence Reason.
Link the Absence Reason to the relevant absence class.
Fill out the Description and Unique Code fields.
Click Save.
📌Note: You can edit or delete an absence reason once you've completed steps one to four above.