All the above comments are great discussions on the theory of virtual libraries. Now for some practical advice.
My suggestion is to create a "Virtual Library" custom column, that holds tag-like information.
Figure out what Virtual Libraries you want. For instance, suppose you want a "Fiction" virtual library.
Go to one of the books that should be in the Fiction library. Type "Fiction" into the newly created Library column. Now in the tag browser, click on Virtual Library -> Fiction. This will create the search that you'll use to build the virtual library.
Create your "Fiction" virtual library from the current search.
Repeat for each of the virtual libraries you want.
You won't be able to right-click and send a book to a virtual library, but this method is the next best thing. To put a book in a virtual library, just add that library's name to its Virtual Library column.
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