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This is easy. in your script capture the last portal row #, increment it by 1 and set that field when you create the record.
You can use Last ( portalrel::prowNbr ) or GetNthRecord ( prowNbr ; Count ( portalrel::ID )) to get the last #
Pueblo Systems, Inc
Oh, thanks forgot about that!
But I forgot to mention that they don't just add the related item on the same screen as the portal.
They do have some people that enter the info the same layout the portal is on, however, there is a iOS optimized layout where they add these items without the portal on the screen.