Try this approach:
Define a calculation field, cRow, in the portal table that concatentates all the fields you want into a single string.
Field1 & " " & Field2 and so forth.
In the parent record, define a calculation field as either:
Substitute ( List ( PortalTable::cRow ) ; ¶ ; " " ) //if you want a space between each portal row's data
Substitute ( List ( PortalTable::cRow ) ; ¶ ; "" ) //if you don't want any character separating each portal row's data.
Export this second calculation field in place of the portal records.
You didn' t say what should separate the fields. If QuarkXpress can accept a comma-separated file, then you COULD create a reasonable facsimile using a calculation field.
However, the best method is to export as XML and use a custom stylesheet to transform the output to your required format.