Hi Ashwani.
When you want to use new Input-fields in Travel request Web Dynpro you can first look at the Customizing, if there are a few fields, that are not enabled and that could help you.
Financial Accounting -> Travel Management -> Employee Self Services -> Interface Configuration for Web Dynpro Interface in Travel Management -> Schema and Single Field Control for Web Dynpro.
When these fields do not help you you can modify the Standard Web Dynpro Views in package PTRM_WEB_UI. These WDs are made with the Floorplan Manager and not so easy to modify/understand because they depend on each other.
We change the GENERAL_DATA_VIEW View in Web Dynpro FITE_VC_GENERAL_DATA and it works fine.
Hope it helps.
Regards
Michael