You should be able to turn off a Problem Type and it not effect past information. This is an outdated design. If a school used something 8 years ago, and now doesn't there is no way to take that problem type off the options. You should be able to toggle off and on the problem type from being shown without it messing up anything in the database. If you won't give us this feature, at least let us BULK change the data to a new problem type. Which BTW is a goofy solution since the whole point of the system is to keep information that is meaningful and not have to manipulate it just to take away a problem type.