Your question is not entirely clear.
a. When you say I have to manage sent mail of created sent folders.
Do you mean that you are managing the email on one PC running Outlook, or are you managing Outlook on several people's PC, or is this about managing a company's e-mail server?
b. You say I am sending mail to ex employee's email account
Does 'ex' mean former as in someone no longer working for the company or does 'ex' mean example. If you mean former employee, how are they identified, for example does the e-mail subject have 'ex' in it.
c. Does the following: so that particular mail copy must display in specify employees name folders not sent items
mean that you want a copy of each outgoing e-mail to be saved in a folder with that person's name, rather than saving the copy in the single 'Sent' folder. If so how do you distinguish those e-mails that require a copy to be saved in a named folder, as opposed to general emails that are saved in the 'Sent' folder.
With more information it would be easier for someone to offer advice.