Get taxonomylist based on current filtered collection

[bressljr]

I'm trying to use the taxonomy list to create a set of filters. For example, I may have some tags for the following:

Product
--Product A
--Product B
Feature
--Search
--Alert

What I am trying to do is set it up such that when Product A is selected, the taxonomylist updates itself to only show tags that are applicable for the filtered collection. In other words, only show features that occur in a collection already filtered by Product A. Is this possible?

[bressljr]

Any thoughts or advice on this? Apologies if I'm missing something simple.