How to connect virtual box system network to main computer

Hi;

I have a desktop computer, but the connection to the internet is through VirtualBox. My main computer is offline. To download anything, first I download it on my VirtualBox and then, drag it to my main computer.

OneDrive in VirtualBox is active, but I want to know is it possible to connect the network of my main computer to the VirtualBox in order to use OneDrive. (for instance, making the bridge network). 

Please guide me in this dilemma

Morteza_Ali