Hello, I may mis understand the idea of tag hierarchy. From what you said it sound like the ability to click a tag and see all of the notes with the sub tags.. Or something like that? What I meant by command and drag the tag was that in that was I was able to make a stack of tags. Similar to a note book stage. This helps organise what would otherwise be chaotic. HOWEVER... This command thing seems to be a fluke. It worked the first day but does not work now. Since then it seems to be completely hit or miss whether I can drag and drop a tag into another to make a stack...