Client has acquired another brand and is setting up the acquired brand as a child BU in Marketing Cloud. When creating the new child BU we reviewed the current implementation and the Unsubscribe Settings are set to:
Subscribers will be unsubscribed from all business units in the Enterprise
However, it's possible that a subscriber is a customer of both brands so we don't want an unsubscribe from the "parent" to automatically unsubscribe users on the "child" account. What we want is to change the setting to:
Subscribers will be unsubscribed from this business unit only
In reviewing this Stack Exchange post, it seems like this is not possible, but I can't imagine other organizations haven't had the same issue before...?
For our other multi-tenant clients we have a singular Parent BU and each brand is a Child to it; we're OK there because no email deploys from the Parent and we knew this from day one.