I have created a dashboard filtered by country in which I am showing several graphs, most of them time series line graphs. What I would like to add is a graphical country comparison. After selecting a country from the main filter, I would like to be able to add on a selected graph, one or all the depicted time series, but for another country in order to quickly visualize a country comparison.
Try making a copy of this worksheet, and making a dashboard with the two worksheets side-by-side (or above/below each other, etc). Show the Country parameter for both, and make sure to select "Apply to worksheets: Only this worksheet" for both copies of the country parameter.