To be able to import Omneon QT reference files correctly, you will first have to create a placeholder item with the correct number of video and audio components. You can read more on how to create a placeholder here.

When the placeholder is created, you can start importing the files into that placeholder with the following POST command;

POST /import/placeholder/(item-id)/[container,audio,video]

More information on different values and parameters when importing files to a placeholder;