Hoping you can help!! 

We have many (1,000) generic non-inventory items already set up in our QB file that are linked to our P&L accounts.  If I want to get more sophisticated in my project cost reporting and link expenses to a job's "phase" (which I set up as service items), do I need to create a new (duplicate) item that reports up to the new project "phase"?  I guess what I'm trying to figure out is if I need to blow away all of my item history because now I want to be more detailed in my project costing.