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Then you use the function List ( ) and your field in the Order Item so that it could look like List (OrderItem::Description)
This will create a list of your order items descriptions. If you do not want them to be separated with enter you can then do
Substitute ( List (OrderItem::Description) ; "¶" ; ", " ) and you will have it a text following each other instead
What format are you using to export the data? If you include the related records in the export order, the Excel format will automatically include the related records and you don't have to echo the data back to the parent.
Thanks so much!