When you use the Copy Items feature in Portfolio Web, you aren’t creating copies of records; you are making copies of the files themselves. There is no way to copy just the records from one catalog to another in Portfolio 2016.
You could theoretically create a new catalog and set up a watched folder that is a subfolder of a watched folder in another catalog. For example, you could have a Digital Assets watched folder, with subfolders for each year: 2016, 2015, 2014, etc. You could create a catalog for 2016 Assets and have the 2016 subfolder as a watched folder.
However, we don’t encourage this for files that are still being actively worked with as there is no way to keep records in two separate catalogs in sync. If you update metadata in the 2016 catalog from my example above, Portfolio embeds the changes to the metadata in the file and updates the file modification date. The Digital Assets catalog will see that the file has updated and use the embedded metadata to update its record, then write the changed metadata back out to the file (to ensure that the file has the same metadata as the catalog record), which updates the file modification date again. This will cause the 2016 catalog to see that the file has updated and update its record… I think you can see where this is going.