how to add foreign key reference to asp.net identityrole

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MVC

C#5.0

EF6.0

how to add foreign key reference to identiyrole in asp.net identity ? i have a domain class called device, i want it to be accessed based on the application user role. example: application user roles (AE, EE, SE..) each device is attached to particular role and users who belong to that role can access the devices.