RMA for Return parts

Hi,

I have a question here. Do any one use RMA method for the return parts?

If we create a new a part # (RMA) to identify from the original part #, how to later re-align to the original part # if we need to ship the same to the customer back?

What are the pros & cons of going for RMA?

Please do let me know the steps to use RMA.

thx,

pri