First you will need the Blu-ray / HD DVD Video Plug-in installed. http://www.nero.com/eng/bluray-hddvd-video-plugin.html
Once installed, in Nero Burning ROM there will be two new menu called Blu-ray Disc Copy and Blu-ray Disc (UDF).
Make a new compliation using the Blu-ray Disc (UDF) at manually set the file system to UDF 2.50.
What kind of image is it?