I (might) want to treat shop.example.com as a separate tracking entity from www.example.com with Universal Analytics. Here, Google says
Google Analytics automatically excludes the domain associated with a property as a referral source, so you won’t see self-referrals in your Analytics reports.
Will assigning a separate tracking ID to shop.example.com make GA treat it as a referral source to www.example.com, and vice versa?
(I do want blog.example.com, for example, to be excluded as a referral source.)