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This question was asked before here:
However, I'd like to request a different way of doing it - basically how Google handles multiple accounts tied to a single "master" Google login.
From a UI perspective the only thing that would need to change is that when logged in, in the top-right drop-down, add a list of "other accounts" which have given their explicit permission to be a child of another account.
From a functionality perspective, it's basically the same thing as impersonation except that it would be user-level access to impersonate another user. Again, the permissions would be that the user would have to login to the "sub account" and explicitly give permission for the "parent account" to impersonate it. From that point forward the password for the child account shouldn't be needed because in order to give permission to the parent account a full sign-in was required.
Other people have suggested this before so I think there's a use case for it. But I'll give mine as well. We've got several "monitoring" email addresses which handle logging from our own software. So "errors@", "reminders@", "bounces@", etc are all their own separate mailboxes, but I as the software developer check those inboxes occasionally to view diagnostics. But I don't want those messages in my inbox. So it would be nice to login with my inbox, and with a single-click switch the UI to another mailbox without having to login again.