Assign Security Zone Permissions to Portal Role

Hi all

I have created a portal role, say 'ABC', in my folder and assigned some users to this role. Now I want to assign security zone permissions for this role, ABC. When I try to do so, I am not able to find this role under 'Assign New Permissions' of permissions editor.

What more do I need to do to get this role for assigning permissions?

I am using Netweaver 2004s.

I appreciate your answers with good points.

Thanks in advance

Tejo