New to this forum but a longtime subscriber to the newsletter! Hoping someone can advise here - my research so far has been inconclusive.
I work for a company that has two main businesses - a magazine and a bookshop. We are just kicking off build of a new website for the bookshop (to replace the existing one). The two are run completely separately online, and have very different sites.
As part of the new build, the decision has been taken to move the bookshop site to a new domain: its existing domain is not meaningful, and if we're going to take an SEO hit, we figure it's best to do it at relaunch, when we'll be busy with the 301s already. There is significant interest in moving the site to a subdomain of the magazine, instead of a completely new domain, mainly in order to be able to monitor customer journeys between the two sites more easily via GA.
My main question: How might this affect traffic between the two sites, in terms of how it's viewed by Google? At the moment, the magazine is a significant referrer to the bookshop. If we moved the bookshop to a subdomain, would all those links then be counted as internal, and the authority transfer adversely affected? Or does it not make any difference? Are there any other SEO-related factors we ought to consider?