Layered Activity Categories

I think that the hierarchy approach could be improved by creating a cross-sectional layer through the hierarchy. (using big words that don’t mean anything)

Work->

  • -> Meetings
    
  • -> Programming
    
  •      -> testing
    
  •      -> training
    
  • -> training
    

Then each of then what you have is groupings inside and around there

ClientA
ClientB

I realize this could be very complicated to graph out if both were structured, or if it was just free tagging. Thus my request is one to be a hierarchy and the other to just feed as extra data within the category.