What are recommended steps in setup when EAM employee departs

What are recommended steps in EAM application, when some employee departs from company? We have defined him/her in resource groups, departments and there exists also history of his/her work. If employee is replaced in resource group by some new one -> all work orders that were done by departing employee, are shown that new employee did them. If this employee is deleted from resource group, his/her history work is not there (employee is now empty). If we let this departing employee in resource group -> We can still assign some new work to him/her (assign employee function enables it).