As far as I know, there's no way to add display case shelves in the display case manager.
You're stuck using whatever was manually entered.
This is also slightly related to a bug that if you attempt to add a new shelf after the Museum Display interface is started in a session, that it won't track any new shelves until another session is started. If there's some way to actually refresh the case and shelves, it's fairly obfuscated.
You're stuck using whatever was manually entered.
This is also slightly related to a bug that if you attempt to add a new shelf after the Museum Display interface is started in a session, that it won't track any new shelves until another session is started. If there's some way to actually refresh the case and shelves, it's fairly obfuscated.