Hi
If you mean that there are upwards of 200 "Sections" per document and each section has the same header the as long as the header in each section is linked to the previous one then any changes made in the first Section will automatically update the linked headers.
If you are talking about automatically updating the headers in multiple documents then you could create a master template with the headers contained therein. Then you create a separate Job Template where you link each field in the header to the Master template. Then any changes to the Master Template headers would be automatically replicated in each of the Job Documents.
Hope this helps.
If you need further assistance then let me know.
Good luck.
Tony