Note:
Copying them did not help. Do I need to keep a specific file structure while copying?
Do I need to DELETE the original content with File structure from the installed location (/Library/Application Support/Steinberg/Content/Groove Agent/VST Sound)
I’ve never tried to breakup the file storage locations, and this sounds like something you are trying to do?
I did move EVERYTHING (35G) to a diff SSD, however, and here’s what I did. I created a duplicate ‘VST Sound’ folder on the SSD that I wanted to use. Then I copied all the VST Sound files and sent them to the new folder on the diff location. Then I changed the name of the original ‘VST Sound’ folder to something diff so that Cubase couldn’t find it.
Then I opened the S Library Manager and clicked on the gear icon in the upper right hand corner of the app. Here an option appears that lets you choose a ‘Library default location’. Here I listed my new location.
At this point, you will need to open Cubase and try to open your various instruments and Groove agent. You will need to locate the folder and file locations. This may seem a slow process, but after you locate a few items, close the program, and then your DAW, and then turn it back on and open the Library. Click on the Gear icon again and confirm that your location is still there. In my case I found that all the VST Sound files were now listed in the new location under ‘Details’ of each application.