The x axis has date, first in months, then the next 4 weeks.

 

The first y axis will be for a stacked bar chart, and a target line on the same axis. This y axis will be numberic

 

The second y axis will be a line chart, with a target line. This y axis will be percentage based.

 

I've worked out how to get the dual axis working and I have the target line added for the first y axis as a line. But when I add the target line to the second y axis it appears the cumulate from the figures of the other line on this y axis.

 

I probably haven't worded this very well. I don't seem to be able to upload a picture of how the graph looks, as I have the graph working in Excel.