Hi, i have this project and i’d like to ask you some questions.
Is it possible to create a Hill and has tunnel in it?
I’m an architecture student and going with this project elevating my main building and creating a tunnel inside that hill for road development. 
Hoping you understand what i want to portray and ask. Thanks in advance!
Well, sure you can do that. You can build a hill easily enough with the Sandbox tools, and then you can just intersect it with a cylinder or whatever shape the tunnel is.
Is that all you wanted to know–whether it’s possible? I guess you can come back when you have a specific procedural question.
-Gully
i guess i think? if procedural is very long i think this is enough, i might waste your time typing xD
i’ll try making contours and going for push and pull tool. that’s the only thing i can think of having tunnels 
I just did a Google Image search on “tunnel cross-section” just to see what would come up. Hey, friend, if you’re looking for some detailed ideas about tunnel construction, take a look.
-Gully
ohh Okay!! i got the idea now! thanks mate 
Here’s a very rough version of how to intersect a tunnel structure with a hill.
omg just what i wanted to do!!! THANKS MATE !!!