Hi Farroque,
I don't think it is possible to achieve in standard SAP EM.
Functionality which you want achieve (correct me If I am wrong):
1. Instead of copy and paste PIN data in SAP WebUI.
2. Upload excel or text file from local PC and search all Item PIN in Search Result Window.
Solution:
1. Enhance Webdynpro interface component controller -> Go to SE80 -> Web Dynpro Comp. /Intf. -> /SAPTRX/EM_FPM_UI -> Views -> Implement browse button and upload through custom development Upload and Download files in Webdynpro ABAP - Web Dynpro ABAP - SCN Wiki
2. Class /SAPTRX/CL_EM_FPM_UI -> Method GET_EH_DETAIL_FROM_SEL -> Enhance /SAPTRX/BADI_WDA_UI or /SAPTRX/BADI_FPM_UI -> Interface /SAPTRX/IF_BADI_FPM_UI or /SAPTRX/IF_BADI_WDA_UI -> Implement custom binding in BEFORE_SEARCH_BAPI and AFTER_SEARCH_BAPI.
This will be fully custom option to implement. Please check and let me know.
Regards
GGOPII