Hello Sushanta (Sunny),
For some reason I get an error when trying to reference you in the usual way by putting "@" in front of your name. Perhaps it's because of the "(" and ")" symbols or the space in your name.
There isn't a way to club reviews like you describe. All listings are treated as separate listings even if they are different combinations of rooms in the same place.
With, for example, two listings where one is the whole house and the other is a private room in the house the reviews for the private room might be very good but those for the entire house might be bad. This could happen if the entire house was more expensive than expected or if, say, the kitchen was very small and not well equipped. To allow for a situation like that, all listings are separate and reviews for one can't be shown on another.
When prospective guests read your listings they can see text saying "This host has 15 reviews for other properties." and a button to click to see those reviews. They can, also, see all your reviews for all properties by clicking on your profile photo.
I noticed one thing with your plantation bungalow listings. You say that you have put up the entire bungalow as one listing. I presume that that's the listing with no reviews yet and a price of 6,474 Rupees.
The description for this, like the other two "Coorg" listings syas "Private room". Unless I'm wrong, should it say "Entire home"?
Steve.