Just as the title says, I need to launch a script when a user adds a new portal row. I am trying to use modify - but it doesnt seem to work when a new row is added, maybe because its not an existing row? Not sure. Any work arounds for this or ideas on how I can prompt a script to run when a new portal record is created? Thanks!

Rather than on modify, try OnObjectValidate.

... ideas on how I can prompt a script to run when a new portal record is created? 

 

Timing is everything here.  Do you want the script to run when the User first clicks into a new empty row (using the trigger to perform tasks before the User begins)?  Or should it run after the User is finished with a single field (and if so which field) or after User finishes all their data entry on the row?  

 

Also, if there are tasks to perform beforehand and/or if there there are tasks which only be performed if the record is new (but not if it is modified later) then you might consider removing the 'Allow Creation' on the relationship and instead add new records via script to begin with.  So really we need more information to offer the best suggestion.  :-)