When using a dual report it allows you to add another report, to an existing chart. Giving you a dashboard like view to compare and drill down in to valuable data on one screen instead of having to go back and forth between different views,
In AppStudio, to add and position another report to an existing report you would first to select the report you want to add it to, for example a bar chart, and then scroll to the Dual Report tab. You then need to select the report you would like to add, once selected it should show a new selection list to decide where you would like to position it (Above, Below, Left, Right). Once you have the position you want you can save at the bottom.
The eligible reports which allow for dual reports are the following: Area, Area-spline, Bar, Bubble, Column, Cumulative Matrix, Gantt, Gauge, Google Map, Line, Map, Monte Carlo, Network, Pie, Polar, Scatter, Spline and Summary Series.