Photoshop Elements --> Tag structure file location?

I am moving files from an old computer to a new hard drive.  Everything went fine with moving over my images, and the image tags have been imported.  However, I completely lost my tag *structure*.  So all the tags are now in a big long list (not grouped as they used to be).  Is there a file that I can import / move over that dictates the structure of the tags database?

Thanks.
bluerocketAsked:
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