Hi there... I think I might have something that could help you. I'm not 100% sure if it's exactly what you're looking for, but I remember hearing about this online school called ELVTR that offers music industry courses, specifically an A&R Manager course that covers a lot of management aspects for the music business. I still have the link somewhere... ah, here it is: https://uk.elvtr.com/course/a-r-manager. I haven't taken it myself, so I can't personally vouch for it, but maybe check out their website and see if it's what you're looking for? The site should have all the details about the course content, schedule, and pricing. Hope that helps!