A lexicon’s ''Anagrams'' cardbox is never actually subdivided, so what you are wanting is to run a search-restricted cardbox quiz. You’ll find the option to impose a search restriction in the ''New Quiz'' dialog in both NZ and NZM. You In NZ, you can save that quiz as you would any other quiz, then load it when you feel like quizzing on just the <tt>-ING</tt> words, or whatever. Since the NZM interface’s selection of search options is limited, only NZ can create a cardbox quiz that is restricted by probability or various other conditions, but (aha!) once you’ve saved that quiz and synced it to your mobile device, the quiz engine in NZM will respect the search restriction when you load that saved quiz.