I would like to confine the songs in my track list to those I have individually downloaded from third-party sources. However there are now tracks in my track list from a few of the albums in my library (not all) and I would like to a eliminate these from my track-list if possible. How can I do this?
Two suggestions:
Tag the tracks you want displayed.
Then filter by that tag.
Or
Create a new watched folded, called say “my tracks”.
With the OS’s file browser move the track folders/files to that watched folder.
Then filter by the watched location.