Hi Sebastian,
i´ve simpe followed all steps (without 6a) from answer 7 on this thread.
http://forum.simflight.com/topic/77521-ai-traffic-switch-from-old-doha-to-new-doha/
Before i´ve reinstall and then new install MyTraffic2010 and additional i´ve change the hombase from Qatar Airways via the MT editor.
Now, Quatar Airways is present in OTHH with random generated flights, but in OTBD are also a few Airlines present. This is not 100% correctly, but i´ll make only a few flights from and to OTHH.
Best regards from Germany
Frank