A process manual can describe every possible route before you understand the ordinary one. To get oriented, ask for an appropriate completed example and follow its path. Use material you are authorised to access, with sensitive details removed where necessary.
Follow the item, not the department list
Start with what triggered the work. What arrived, who checked it, and what allowed the next step to begin? Keep the same example in view rather than jumping between unrelated cases at each stage.
Write down the evidence of each transition: a recorded decision, an updated field, or a confirmed handover. If a step is described only as “then someone deals with it,” ask what actually changes and how the next person knows.
Mark exceptions separately
Your example may include a delay or unusual correction. Label that feature instead of assuming every case follows the same path. Ask which parts are routine and which depended on this particular situation.
Finish by explaining the journey back to a knowledgeable colleague in a few sentences. Invite corrections to your understanding before trying the process yourself. One example cannot establish every rule, but it can give the manual a concrete shape and reveal the questions you need to ask next.