"...down to a lower level" could mean that a hierarchical project type list is needed. For this, one would need to create a custom static-dependent lookup, rather than using the out of the box "Idea and Project Type" lookup.
We've been using our own static-dependent, hierarchical Project Type lookup for years, long before Ideas were introduced into Niku/Clarity/CA PPM. I'd like to get back to a simpler, single level static Project Type lookup, allowing Ideas to pass their categorization onto our projects using the out of the box feature, but this is not high on our priority list.
BTW, Lisa, your last response seems to have been cut short, as it only includes "Yes," followed by your signature - the comma appears to indicate that you were going add something else.
Dale