How to have multiple series for a trellis chart
I am trying to add multiple series to my trellis chart. I can add the second category with just the first Y-value, but when I add another series Category 2 dissapears and I cannot add a Category 2 unless I remove the additional series. This article shows a screenshot of a sample trellis chart that has several series fields, so it looks like having more than one value series is possible, but I cannot get it to work for mine.
Any help on how to get another series added would be awesome!