UPDATED: Copy From Start to Stop v2.1
Copy From Start to Stop v2.1 makes a copy of the selected track using its Start and Stop times as the beginning and ending of the new file and adds to Library, with option to name new track/file. It's handy for creating a new file from a portion of a larger file.
Works as a fine companion to the script Player Position to Start or Stop, which sets the Start or Stop time of the currently loaded track to the time of the paused player position.
This latest version is a general maintenance update because it may have appeared damaged on recent operating systems.
More info and download is here.