Searchable Tag hierarchy

[#1]

Hi - Is it possible to setup a Hierarchy of tags that can be searchable (either API or UI) through the parent tag?

If for example I have 4 tags, company1,company2,company3,company4 and a parent tag of vendors. Is there a way for me to search vendors and it to come up with the tag list of company1-4?

I have created tags that inheirt from others but cant see this relationship in the UI