I understand that Q2A has multi-site options within it's core however, I couldn't get it to work. I am thinking that I am doing something wrong with the cookies. After thinking it over, I want to go another route. I want to have one site that handles all the logins and user management. The other three sites would have it's own database and run on a subdomain. I think for growth that would be the best way to go.
I am no expert on this and I am hoping that someone here as some knowledge on this. I am doing research before I do all the work and realize I did something wrong and make myself more work.