How to create 2 separate libraries on one computer ?

Question

I have two music folders (such as "kids" and "Adults") in the "My Music" folder and I want to create 2 separate libraries for managing the music for Kids versus adults.  I cannot figure out how to create a new iTunes library limited to a single folder tree ("kids" for example) . . .  because iTunes only gives the option to "Scan for Media" which is promiscuous and scans everything, regardless of where the library files are created.
I know I can temporariry remove the "kids" folder then create a the "Adult" library.  Then temporariliy remove "Adults" folder and create a "Kids" library, but thats requires hours of file copying to and from an External USB drive.  Once the two libraries are created then they can live together on the same computer . . . but how to get the libraries initially created is the question ?    Maybe I will try NTFS file permissions to make folder 'A' invisible to iTunes while creating the library for folder 'B'.
But there must be an iTunes option to do this . . right ?

Answer 1

RESOLVED . . . Still looking for an iTunes method of creating 2 libraries on 1 computer.   But if it helps for others, you can use NTFS file permissions to deny access to one folder tree to keep iTunes focused on the other folder tree it can see when you select "Scan for Media".
Then reverse the permissions to create the library for the other folder tree.   When done allow access two both trees and they will then co-exist on one computer. 
The only remaining inconvenience . . . I have iTunes Match set up on library "Adults".  If I sign into the Apple store to buy a song or get artwork from library "Kids", iTunes is populated with the "Adult" songs from iTunes Match.  I just have to avoid staying signed into the Store from the "Kids" library, so someone doesn't start downloading "Adults" music into the "Kids" library.
To inform the context of this question, we have 3 Apple portable devices that play from our iTunes Match "adult" library.  We also have "Adult" and "kid" devices that are not Apple, so we just copy the respective folder tree to non-Apple devices.
So the use NTFS DENY permissions works for creating two libraries on a single computer, and it only take a few minutes to do,  BUT FOR THOSE WHO AREN'T SYSTEM ADMININSTRATORS, IS THERE AN "APPLE WAY" TO DO THIS ON A WINDOWS COMPUTER?