virtual bool AddVirtualSubject ( const [FLiveLinkSubjectKey](API\Runtime\LiveLinkInterface\FLiveLinkSubjectKey) & VirtualSubjectKey, [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [ULiveLinkVirtualSubject](API\Runtime\LiveLinkInterface\ULiveLinkVirtualSubject) > VirtualSubjectClass )