Of all the features and capabilities in Premiere Pro, I think metadata is the most overlooked. Granted, Premiere Pro's metadata schemas could use a real facelift. Can you imagine a Lumetri Color panel-like experience for metadata? Until that comes, we have this fantastic Premiumbeat tutorial by Jason Boone to help us understand metadata in Premiere Pro. In the video, at 1:36 Jason covers the differences between the Clip and File sections of Premiere Pro's Metadata panel. At 3:41 see how the Metadata panel can be customized using the Metadata Display window. Lastly, at 5:02 Jason shows how to add custom metadata to your clips. Remember, you can add the same metadata to multiple selected clips in the Metadata panel.
In this video tutorial we'll take a look at a few different ways to use metadata in Premiere Pro. —Jason Boone, Premiumbeat Blog