Usually you have a grand overall process map in the QMS, and the QMS links to lower level procedures. Such as in "my world" of statistics, there was the company QMS, which flowed down to a QA Plan, which included as a section how to do performance analysis and trending. Yes, there was a how to do trending diagram. We had cross reference lists in the QMS to lower level procedures and a document control system.
I think you are over-thinking this. You need to write your company mission / vision/ QMP / Financial Documents / Testing Documents / etc etc etc so they work together as a system for your company. Working with the Department of Energy, there were documents like this that told us what were the standard for a QMS, but not how to write a QMS. Such as
Quality Management System — NNSA Directives
As an example, for documentation they specify:
6.2. DOCUMENTATION REQUIREMENTS The level and type of documentation established for NNSA is reviewed periodically to ensure it remains appropriate for the following: • Activities performed, • Methods used, • Complexity of processes and their interactions, and • Skills and capabilities required by personnel.
They didn't tell us WHAT the documentation had to be, but what needed to be covered.