When I first opened my shiny new Raspberry Pi 3, my excitement was soon dampened as I had no network or internet access; rendering my Pi at least half as useful. Luckily, my techie is a Linux wiz and he created a custom build that was able to authenticate on our network.
The build document you need is Raspberry Pi Build Doc. I suggest you give this to a tech if you have one. Once built, the Raspberry Pi SD card can be cloned. Watch the video below: