Processes are chains of activities that begin with a start and end with a result. They must either be well documented – or automated.
For analysis, large processes should be divided into useful smaller sub-processes. There is no rule for how deeply you divide them.
From the process : “Incoming order”, “Office”, “Patent application” become ( for example defined by department ) sub-processes like: “Incoming order”, “Incoming mail”, “File attachment”, “Creation of a file”, “Secretarial staff ” and “Order to attorney”.
Now it is best if you decide for yourself which processes can be automated, what makes sense as a unit and which interfaces you can use between processes.