Hi Sagarika,
Please find the below details for TREX.
1. Where can i check in system that TREX set up is there in the system or not
-->SPRO->CRM->UI Framework->Enterprise Search Integration.
2. which version i have to (currently am using 7.0)
-->you can go with 701
3. if TREX has to be set up on system what should i do
-->Activate the Enterprise Search business package and the ESH Cockpit service.(Tcode SFW5)
-->Define the RFC link to TREX(Get the RFC from Basis)
-->Create the Search Object Connectors(if you have custom fields then you need to create custom connectors)
-->Index the Search Object Connectors
-->Schedule regular indexing of the Search Object Connectors
4. what are the RFC required for TREX set up, what kind of values to be given in TREX
--> You Can ask basis people to create the RFC .
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Vijay Duvvada