I was looking for it to be done in a trend though dashboard actions. That way they can see how the percents are changing over time through whatever detail they want. This would allow them to identify spikes. Hierarchy would go -> Count > Type > Class > Code. Numerator would be the dashboard action and denominator would be 1 level up.
ex: Code selected count (numerator) / that code's class count (denominator).
ex2: Class selected count (numerator) / that class's type count (denominator)
Type, Class, and Code would be selected through my charts, so there will always be one level above it.