Ability to create parts categories

It would be nice to be able to add a few more parts categories that could be tracked by the system and be able to run reports on them : Right now we have built in ones ( parts, oil, tires, etc…) but anything we add to the list isn’t tracked by RTA. This would help us to split on inventory reports for our own requirements. As an example, Financials is always asking me for quartely cost of items used like grader blades, ground working tools, road signs… I use a work around by using fit codes but it’s getting to be a pain.