Smoozesailing
The Australian Jeppesen Airways Manual (and AIP) are quite specific re where to set the altimeter.
We use QNH to 10,000', have a no-cruise layer, called the transition layer, between A100 and FL110 (depending on QNH) and Flight Levels above A100.
Jeppesen/ATC/AU-501/1.2.1.4
The position to change between QNH & 1013.2 hPa shall always be in the Standard Pressure Region on climb after passing 10,000ft and prior to leveling off, or on descent to a level in in the Altimeter Setting Region prior to entering the Transition Layer.
So in plain English, set 1013.2 at or after passing 10,000' on climb, and set QNH prior to FL110 on descent to any level at or below 10,000'