with EEA.Nav you can let users filter content by tag, however it automatically pulls a list of all tags used on the site. How can I create a subset of tags, in other words, if I want users to only be able to select among 10 tags?
I would do it by defining a new index, and a custom indexer that only indexes those tags in your subset. Then you can create a facet that uses your new index, and it won't show any other tags. However, this is not a TTW solution.
Install Products.ATVocabularyManager and define the subset as a vocabulary.