If an employee leaves the company, it becomes necessary to assign the customers to other employees.
There are two ways how to do that.
Find a dismissed employee
Go to the CRM filter > Deals in progress > Responsible person > Dismissed.
Select a dismissed employee and distribute the customers and the deals.
Hire an employee back
In Bitrix24, an employee cannot be completely deleted, so you can hire the person back at any time.
The dismissed employee will not receive any notification about that, so the risks related to the security of your data are minimal. Don't forget to fire the person again.
To hire an employee who was dismissed, go to the Employees section in the left menu, click the Employees tab, select Fired in the filter and click Find.
Open the action menu and click Hire.
After that, go to the CRM and transfer the necessary entities.