I've got a stacked bar chart. I'm displaying a set of floating bars to represent hi/low ranges for some metrics, by using a transparent fill on the bottom section of the bar I achieve the desired look.

What I now need to do is add a horizontal line across the chart to indicate how a particular users score relates to all of these hi/low ranges therefore the placement of this line needs to be dynamic based on a value in a cell.

Is there anyway to do this as I can't find an easy option. If this was a simple bar chart I could add the target scores as new series and use the line chart type but I don't seem able to overlay a second series on the stacked bar chart.

I'm using 2003 at the moment but run this in 2007 if that helps.