Hi Annapurna,
it is rally a complex solution. Ina give you only high level steps to implement such a solution. You need a Developer who is really familiar with ABAP memory.
1) Crearte Tables in ABAP Memory which contain all the data which you want to search for. Please have a look at Structure hrtmc_t_search_result. This is the (deep) structure which is posted to the fronted.
2) Create ABAP Coding which exports all the OM and PD Data which should be searchable later to your Tables in ABAP memory.
3) Create a Search functionality which performs a search on your data in bap memory.
4) Map the your data to the structure hrtmc_t_search_result.
5) Enhance Method TRIGGER_ADV_SEARCH and TRIGGER_SIMPLE_SEARCH of class CL_HRTMC_AC_SEARCH. They should use your new created search method instead of the standard search methods which get date from TREX.
If you use standard data structures you can use standard UI's to display the search results.
best regards
Martin