How are you doing the script import?
In any case, you can use Go To Related Record to the gind the related records and fields in the portal.
However, I would like to know why you have to two with the exact same fields? If they one difference in them like, Old and New, you can create a field that can discriminate between the two categories (also with use of a find). Then you can make the field into a checkbox on the layout, so to switch between the two categories either check or uncheck it.
If that is confusing let me know.