Hello there,
I can model your business process according to rules and assumptions in description, and can also send you some of my previous flowchart, you find here some similar work :
https://www.fr.freelancer.com/projects/writing/Bizagi-Documentation-Standardization/reviews
https://www.fr.freelancer.com/projects/word-processing/Document-Business-Processes/reviews
I use Bizagi Modeler as software.
Do not hesitate to contact me for more details, I will be glad to offer you my services,
Thanks & Best Regards!