Prepare source visuals

In this example, a bar visual World Population is used as the source (controlling) visual.

The visual has the following settings:

X Axis shelf: un_region. You can also choose to use a dimensional hierarchy that represents the [un_region | un_subregion | country] tuple.
YAxis shelf: population, as sum(population); alias it as Population.
Filters shelf: year, set to 2010
Under Settings, select the Parameters menu, and enable the Send parameters with dataset scope option. Do not select other options in this menu.