Follow these steps to install and use a custom VI Analyzer test LLB:
Note that the VIs within the test LLB must be saved in a version equal to or older than the LabVIEW you are using in order for it to be usable in the VI Analyzer.
Alternative to "Note 1": open and run Dflt Data Dir.vi from File Constants Palette.
Alternative to "Note 2": Since LabVIEW 2013, you can also execute execute the Appliction Method Menus:Refresh (see in LV help).
Tests can be placed in subfolders (of [LabVIEW Data]\VI Analyzer Tests). They will be shown in a subtree in test the selection.
Example with folder myTries: