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Try this: in the portal table, create an unstored! calc field - say, 'cGetRecordNumber' – defined as
Get ( RecordNumber )
Use the following as a Hide if calculation for portal objects:
PortalTable::yourGroupingField // e.g. Name, or primary key
PortalTable::cGetRecordNumber - 1
In English: the object will be hidden if the grouping field is the same as in the previous portal record – e.g., it is still within the same group.
Obviously, this only works if the portal or the relationship is sorted by groupingField – but then, it only makes sense if that is the case.