[BonzoDog]

Look up Process Mangement on Google and there are endless tools for doing this. The problems are detail, getting the real story, the constant change and the time taken.
You also mentioned SAP, a system that I find fundamentally slows down a business and adds enormous cost without foreseeable benefit.
Having seen the results of various process mangement exercises my concerns are that it is hard to measure any real tangible benfit in terms of cost and ROI. I see it as an unending, pointless discussion between the process bound departments trying to justify savings that can never be proved rather than concentrating on what brings in the business and what makes the customer happy. This latter tends to be forgotten in these exercises. I would find the key people in the department who really know what is happening and in as short a time as possible take a high level view and whatever detail below that is availbable.
Cynical, yes but I find that this is a triumph of bureaucracy over common sense. There must be a cost cutting accountant behind this somehwer in the loop.