Excel 2016 secondary axis

[fcbmq]

I am trying to set up a chart with revenue and EBITDA that has 2 vertical columns for each as per below. I need a secondary axis for the EBITDA but I can't for the life of me figure out how to leave the bars looking as they are when I add a secondary axis. I can't select the 2 EBITDA bars simultaneously to add the second axis only the 2 orange or the 2 blue. When I manage to get a secondary axis I end up with a stacked column, part blue part orange or a line chart for each EBITDA which I don't want. Any ideas please?

 

[GraH]

Maybe consider using a thermometer chart.