We are currently syncing our department specific Confluence space into a Guru collection which we have set to specific permissions in Guru (Department Authors, Admin, Consumers). We would like to have the ability to open up permissions on specific cards within the collection so that the full company can view. Is there a way that can we can do this without copying the cards into a collection that is public facing? 

Essentially the functionality we are looking for is to control the permissions on a card specific level.