I was able to get a stacked column chart with a target line but cannot get a stacked bar chart with a target line.
If I convert the Stacked column charts to stacked bars, below chart is what I end up getting and the option to change axis for the target line is disabled.
One question though, can I increase/decrease the width of the target line in case I decide to increase/decrease the width of the bars in the chart.
I didn't quite understand how you go this part too
"We realize that each bar is staggered at 0.5, 1.5, 2.5, etc"..
How do you know the 0.5, 1.5, 2.5 thing?
In my chart, the target line is actually a Y-error bar. I adjusted it's length by changing the fixed value. You could do it this way, or turn on the marker, and draw a shape/image, and copy that image onto the marker. Either way works.
For the spacing, it's just a matter of thinking how XL spaces things. If you look at the tick marks on y-axis here:
you can think of them as being at the 1, 2, and 3 level marks. THus, the labels are halfway between, so they are are the 0.5, 1.5, and 2.5 mark. We use that to align the XY series vertically.