I"ve called my top level a 'module', and our websites typically have about 6-12 modules. I aggregate the story point estimates all the way up the tree, so I can get a 'total estimated development time' for entire modules. For instance, an 'administration module' may have 85 aggregated points from all of its stories combined. This works well for us.
So, I've been trying to create a pie chart for this on the overview page. In other words, I want the percentage of development time each of all my modules is taking up. So, I would 1.) add up all the aggregated points for all modules to get a total, and then 2.) divide by each module to get a percentage of the development time they are taking up. 3.) Represent that in a pie chart.
If this is too complicated, a simple bar chart would be sufficient as well. With each module on the horizontal axis, and the number of points on the vertical access.
I've included a screenshot.
Any help is appreciated,