Hi Arpit
Please go to T-code /SAPAPO/RLGCOPY - Data Realignment
You can select your PLOB and click on Create/Change Table which will provide you template of your CVC. You can maintain From CVC values vs To-BE CVC.
I would prefer you play around on development system to understand it better.
Please check following link which will give you more information about it.
Amol