I have data with two values that I want to show in a stacked bar chart. The first value is a subset of the second value, that is, the first value is 10 and the second value is 20 (which includes the first 10).

I want to display this as a stacked bar (or column) chart, where the first series represents the subset, and the second series represents the total. Currently, I can only show the 10 as one series and then then 20 as a second series, but I want to represent the second series as 20-10, that is "overlapping" the original series of 10.

See image for example