How to enter Targets in a Histogram

Hi, 

So I am trying to enter vertical lines into my histogram as seen in the image below. Basically I want a way to have the target (green line) and lower bounds (red lines) enter on my histogram without me having to draw a line on the graph manually like I did for this image.

It seems with the histogram addin this isn't possible, but is there a workaround to make histograms with just the regular bar graph? Using the grouping function?