I have a line chart, which has four columns each based upon product group.
I would like to have a unique/different reference line for each product group, but I can't find a way to create it.
In the image below the black dashed line is the Trend, the green dashed line is the Median, both of which are calculated uniquely for each product group. but the Grey dashed line is a reference line which is the same for all four product groups.
Any way to make it unique for each product group.