How to stack only 2 columns in a side-by-side bar chart
I have a bar chart, with a binned X axis by month, and 5 columns by category for each month. Each columns value is a sum. I use side-by-side columns. I'd like to be able to stack only 2 of these columns, because the bigger one's data (A) comprises the other one's (B), so I'd like to do something like "A-B" stacked with "B", using different colors, but keeping the side-by-side columns for each month.
Is it possible ?
Please see the attached screenshot. I want to put together the green and red columns.