Since JRiver doesn't offer a Blu-ray menu, you have to manually configure the files. The hard part is figuring out what files do what. I have several calibration discs and here is what I do:
1. If you have the disc ripped to a hard drive, you can browse to the Disc Name\BDMV\Stream folder in Windows Explorer. Copy or cut the entire Stream folder out of the folder structure and place it elsewhere.
2. Now you can import all the files into JRiver and they will import as separate entries since they are no longer in the original Blu-ray structure.
3. Wait for JRiver to create thumbnails of all imported files. You should be in the Recently Imported playlist automatically in MC18.
4. Tag all files with a Media Subtype of Test Clip.
5. Play files to see what they are. The thumbnail may identify the file. Sometimes you need to play the Blu-ray in an Arcsoft demo or regular Blu-ray player to see the menu and figure out what file is what.
6. Change the name tag of files you want and delete from the library those that you don't want.
7. Create a view to show the files.
Another method is to
create Particles using the playback range.
Below is a picture of all files from Disney World of Wonder imported into JRiver.