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.
Something to note as well is that dual reports can also be used in dashboards!!
Make sure to click the 'Save' button when making any changes in order for them to be added to the next app version. Once you have made all the changes you need to an application you are then ready to publish it to workspace.