(imported comment written by BenKus)
This thread is splitting…
Two answers:
TommyG:
TommyG
In BigFix terms, the 5, 12, 23, and 6 would be the “Applicable” number, but what I mean is… for a particular operating system, only 200 of those 400 are really applicable to that OS. So my report should really look something like:
computername1, 5/186
computername2, 12/210
computername3, 23/186
computername4, 6/125
There really isn’t a concept of “OS applicable” and so you can’t report off of it… You might ask “why not?”, but there are all sorts of problems with the definition of this concept… for instance, what if a patch is in an service pack, should you show it? what if a superseded patch is already installed? what about non-OS patches like Office? and many more quirks like this… So basically a Fixlet either is relevant or not and that is basically all you can report off in a report like this…
jspanitz
BigFix:
Is there a documented way to add such things to custom reports - easily?
Well… “easy” is a relative term… 
To make pretty charts, you can use any technique you might use in web pages (note that the technique that TommyG is using above is basically get the data into a javascript array and then playing around with displaying it)…
We used to use Office Web Controls + javascript in older dashboards to build charts/graphs and these days we use Flex to build our charts/graphs/reports/dashboards because we like it better… If you have any experience with these technologies, it wouldn’t be hard to take the data in those arrays that TommyG cleverly made and make graphs from them…
But if you are new to those technologies, I wouldn’t call it easy at all… Personally my javascript skills are weak and my Flex skills are non-existent… Maybe Zak or Jesse can help you out…
I am happy you guys are exploring the flexibility and power of the custom reports and sharing it with others… That was the original intention when we built the custom reports engine (at one point we considered not opening it up to customers to customize).
Ben