My suggestions:
-either start from a top level view of the company’s processes and then break each down (you might have to go 3-4 levels to get to the actual work). Level 1 processes can be as broad as “create demand”, “satisfy demand”, “run the business” level activities… then Level 2 processes would break each one of these down into more detail (and level 3 would break down the level 2 processes).
-talk to a vendor of systems in this space and let them try to sell you a comprehensive solution–and ask them for the process inventory you’re looking for.
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