Chris_QPW said: First off if you have the totals at the bottom, you can't "collapse" different levels like you can when they are at the top.
Chris_QPW said: Browse some files. Select a menu. What you are looking at is a control called a "tree". This control is used everywhere you have cascading data.
Chris_QPW said: And the last one is to understand how software is really written... The average programmer isn't going to write a report generator, they are going to use one that is provided to them and use whatever "model" it uses.