Are you are trying to book two separate award tickets under one reservation? If so at least use your one free stopover on one of the segments listed and book the rest as an open jaw. Then pick up a cheap one way to complete the trip. Save yourself the intra-Europe award charge.

Something like LAX-AMS(stopover)-BCN. Then PAR-LAX for the open jaw return. Find a cheap BCN-PAR oneway to get ot the open jaw return.

Else wise you will need to probably book the TATL as one award and the intra-Europe as another. That should make nwa.com happy if your dates work out.