A small multiples (column) chart is useful for comparing different metric values across (typically) a timeline for different category elements in a single view. All charts included in the small multiples will use the same scale to display the metric value. The chart can also represent variances (absolute and relative) compared to the average across all category elements.
For this type of chart, the scenarios are mapped using metrics. So the user will need to define separate metrics (for the same set of category elements) representing each scenario. As an example, if you are looking at sales data across months and are interested in looking at how the actual and planned scenarios compare, you will have to define two metrics