The Roles page provides a way to add a Member to multiple Roles.
Add new Roles
Click the +Roles button on the top.
Type the Role Name. Press Enter.
Add Members to the Role
Click the blue + button to the right of the Role name or + Member to add Members to that Role.
Modify Roles
The three-dot menu to the left of the Role Name provides several options:
Edit the Role Name: These are standard roles, new role name will also be reflected on Org Setting > Standards > Roles
Archive Role: Archived Roles will be shown on Org Setting > Standards > Roles
Delete the Role