I am not sure I have any 'wisdom' here, but I think that (c) is likely to apply. I think your stopover is GDN and HEL won't count at all. Here is the definition of stopover in the classic award rules:I am constructing a OWA.
My route so far is:
MEL-CMB-DEL-HEL-LHR
LHR-HEL-GDN
-ground sector-
HEL-HND
Both my first two routes transit in HEL. Will my third flight count as (a) a third transit in HEL; (b) a stop in HEL; or (c) not count as HEL at all?
Grateful for wisdom.
Stopover' in relation to:
(a) an Australian domestic Itinerary, means a break of journey at an intermediate point when onward travel does not take place on the same calendar day; and
(b) for all other Itineraries, including those containing a domestic to international connecting flight, means when a passenger arrives at an intermediate point and is not scheduled to depart within 24 hours of arrival;
Here GDN is the intermediate point. HEL is just a departure airport (like MEL at the beginning of your itinerary). I certainly don't see how HEL could be a transit as you did not arrive there on a flight.
Have you put a dummy booking in the multi-city tool and does it price as appropriate?

