Can someone help me how to tap-off 132kV from tower step-down to 22kV using a prefabricated Gas insulated Switchyard, rural area?

If I understand correctly, you want to know the physical arrangement involved to have a 22 Kv distribution from 132 kv supply.
The arrangement will be as follows :
-tap 132 kv from transmission line by suitable size ACSR conductor through BPI
- connect to LA
- connect to 132/ 23 kv transformer hv bushing
- from lv cable box of transformer, connect 24kv grade cable to GIS by suitable cable termination kit

Hope I could give you some solution.

Thanks Pratik. Its my fisrt time to deal with GIS, prefabricated substation in one of our grid expansion project in rural part of the country. Therefore I want to be familar with the physical arrangement involved.

The 1323KV line to be terrminated at the gantry and there should be isolator Earth switch-Circuit breaker LA and then CT/PT for metering and protection (and Trivector metering room adjacent for revenue metering purpose).
The output of the 132KV line there after can be taken through hollow conductor pipes to Transformer via IBP/LA/Transformer.
The Transformer 22KV can be taken out through XLPE cable and terminated at the 22KV GIS pothead.