Portal : Different Navigation for Different Role

Hi All,

I know in Portal web role, there is only 3 type of role, which is Anonymous, Authenticated, and Administrator.

I cannot use those role, since the requirement, is I want to have the role is Supplier, Consultant and Customer. (all data will be threat as Contact).

Each of role will have different navigation for example:

Supplier => Custom Entity and Article

Customer => Case Management and Article

Consultant => Case, Custom and Article

how I can manage this in Portal? please advise.