I was wondering if it is possible to place a vertical line in the
"Lines on 2 Axes" Chart.

I usually add extra data series if I want to make extra lines but for
this type of graph, it very difficult if not impossible. Adding
Horizontal lines are no problem because that's the direction my data is
going but the vertical conflicts with it. When I try and specify the
location I want the vertical line to be at, it ends up getting very
messy. Any advice?

Judokid