ESS/MSS Customization of Webdynpro java component
I am new to NWDI. I want to customize the personal data screen of ESS (Webdynpro Java Component). In NWDS i have component in product sap.com_SAP_ESS_1. My requirement NOT to change the original SAP ESS component. I want to copy SAP component, then i have to customize copied component. Please help me how to start copying and customize ESS component.
Thanks in advance.