Since you have to get from YHZ to YYZ or EWR with AC or CO first in order to fly LO to WAW and then to BTS, you can't book this online.

http://www.staralliance.com/flightSe...fax+NS+Kanada+[YHZ]%2C+Kanada&fromLat=&fromLon=&To=Bratislava+Slovake i+[BTS]%2C+Slowakei&toLat=&toLon=&depdate=01%2F12%2F2010& departureDay=01&departureMonth=12&departureYear=20 10&returnDay=07&returnMonth=12&returnYear=2010&sev enDayLookUp=true

In order to prepare for your call to M&M, I would check if there are seats available on awardnexus.com first.

Also I would go for YHZ-LHR-VIE on AC & BD if I were you, much shorter travel (12h instead of 18h), much better inflight experience than LO and no backtracking.