I've performance data for each employee for both Q1 and Q2. I'm trying to create a chart where in the user has an option to select which quater he wants to look at. I know I can do this by using a parameter. But, as per my requirements, If a user selects both Q1 and Q2, then a comparison chart must appear. By comparison chart I mean, there should be 2 columns which gives Q1 performance and Q2 performance among different sections. Please let me know how do I approach this problem.