I am, yet again, simply staggered by how awful the Apple Music for Windows app is. I have installed it, temporarily, in a vain attempt to see if there is perhaps a hidden consolidate function that one can trigger. But no. The app cannot rip CDs, doesn't support multiple libraries, doesn't have scripting support which might mitigate some of its failings, and it cannot even display my Apple Music cloud library correctly. Everything shows up as if it has been added today instead of over the last 17 years as it does in iTunes for Windows and Apple Music on my Macs, and what it does show is incomplete. Totally useless. My recommendation is to uninstall Apple Music, Apple TV, and Apple Devices so that iTunes is restored to its former glory rather than being limited to working with audiobooks and podcasts.
See Make a split library portable - Apple Community for advice on moving your iTunes library to a new drive. If it is currently in the standard layout of an iTunes folder that contains an iTunes Media folder, which in turn contains all of your connected media, then you can simply copy/move the iTunes folder to the new location and shift-start-iTunes to access the iTunes Library.itl file on the new path. All of the file references should update to the new location automatically.
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