Bucky,
This is just a terminology problem. In MC we define these terms:
Import: Add to MC's internal inventory. This does NOT move files. It only makes references to where these files are, and reads their metadata (album, artist, etc). This process is how MC keeps track of all media files.
Library: The internal database and the small database files that MC uses to in order to access this data. Generally speaking, you don't want to move the Library from it's default location. ...and you only want one library. Again, this is just the internal data that MC uses to store the metadata from your media files.
So with that said, you probably *do* want to import the files from your NAS and you probably do *not* want to create a new library.
Good luck!
Brian.