Click on the Library icon (the one that looks like the calibre logo) and select "switch/create library". Select a location (create a new folder where you want it) and click the "create empty library" option.
Now, using the same library icon, switch back to the original library (which should show up in the list of libraries under the other options or in the "quick switch" menu). Select the books you want to move or copy to the other library, then right-click > "Copy to library". All your libraries will be listed, and you will have the option to just copy, or copy+delete from original library.
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