Hello Puru,
In order to see the list of the Business roles, you can use the report : All Business Roles
Please refer to help center document : All Business Roles
Also check help center document Working with Business Roles.
As Lokesh mentioned, you can assign work center/views to the user without assigning the business role to user.
Please note that Access rights can be maintained either by assigning business roles to users or by assigning work centers, views, and access restrictions to users directly. If you have assigned business roles to a user, all the access rights defined in the assigned business roles will overwrite the work centers, views, and access restrictions currently assigned to the user. Any manual changes that you have made to the user’s assignments in addition to the business role assignments will be lost. If you want to retain current access rights, see the corresponding documentation.
Regards,
Harshal