A Playstation ID can have only one email address registered to it.
If you mean USERS on your console then you simply need to make the console primary for the PSN ID that has Plus. All other USERS on the same console will be able to play online and access purchased items. The other USERS will not benefit from cloud storage, only the ID with Plus will.
** Engage brain before putting mouth in gear ** ** two-step verification - use it **
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