Thread: Compare different data in the same chart?

Hello. Great site

I'm working with some sales numbers for my department and the total corporation.

I have 2 columns, one with Sales-department-A with jan09, feb09, mar09. ect
and a Sales-Corporation also with jan09, feb09, mar09 ect.

If I want to compare these numbers in a graph.

Is it possible to make an interactive graph where the user can specify what data the graph should show?
For example a graph that shows both Jan09 sales from department A and the corporation.
Or maybe jan09 Department-A sales compared with Department-A jun09 sales?

So like an interactive graph where you can hide and show the difference charts. Instead of making a hundred charts with all the possible combinations of comparisons?