I am a little late to the game but I wrote a blog on segment sharing between Adobe Campaign and Adobe Audience Manager. It is 3 parts and is based on my Summit Session from 2017. It has good content that is very relevant to the question here:(Edited by Moderator to remove links).

Hey Guys - My name is Jerry Helou. I worked for Adobe for 6 years. I was an MSA concentrating on Analytics, AAM and Target. I left Adobe back in June and I currently work for a company called. I see many familiar names on this forum so I am looking forward to collaborating with you on everything AAM...