Dear Chowdhury-Moin-Ahmed-Mujib,
As per Wikipedia, "Terms of Reference" define the purpose and structures of a project, committee, meeting, negotiation, or any similar collection of people who have agreed to work together to accomplish a shared goal. Terms of reference show how the object in question will be defined, developed, and verified.
In your query, you have written that you want "Terms of Reference" for forming an employee separation on account of termination, resignation, retirement etc. The question that comes to one's mind is a separation on account of resignation and retirement is in the normal course. There is no negative connotation attached to it. Therefore, why do you need a committee and discuss the separation? Even within these two also, the resignation is an unplanned separation whereas the retirement is a planned separation. For the execution of a planned event why is there a need for the formation of a committee at all?
Now coming to the separation on account of termination. The employee is terminated because of some misconduct. However, to prove that an employee committed a misconduct an enquiry is required to be conducted. The "Terms of References" (TORs) for conducting enquiry are enquiry. TORs define the scope of enquiry. However, all the misconduct are not the same and these differ from one misconduct to another
Against this backdrop, I recommend you revisit the idea.
Thanks
Dinesh Divekar