I remember iTunes has a shortcut "Cmd + Opt + delete" to delele files from disk, it works in any playlist in iTunes. But now it's no longer available.
Thank you for your help.
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In fact, after iCloud Music Upgrade,
Opt + Delete gives 2 options now,
You can remove local copy from Edit Menu though
You can add a Keyboard Shortcut for this form
Make sure the iTunes Media Folder is set up correctly for you.