Mass role assignment to users

Hi all,

I use SAP NW CE 7.3, the user data is stored in LDAP (sun java directory services). I created around 900 users in LDAP using a script.

I can see all these users in the portal: http://<hostname>:50000/irj

Now, I want to assign a particular Portal role to all these 900 users. I want to use the 'import' feature in the portal user administration.

Please suggest how I can do this mass role assignment to the users or some other alternative.

regards.