You can easily make an employee a leaver when using Polaris Data; the following article helps explain how to do so.
Firstly, you will need to open the employee's record within staff maintenance.
Next, navigate your way along the tabs to the "Employee Movements" section.
Once in the Employee Movements tab, you will need to select the "Mark as Leaver" button.
After you have clicked the button, it will bring up the opportunity for you to enter a leave date, exit interview date, reason for leaving etc. Please note that the leaving date and reason for leaving sections are mandatory fields.
Once this has been completed, the employee will be made a leaver within the system.
A leaver can be reinstated in the future; there is a link below to an article explaining how to do this.
The below video further explains the article.