

If you mean setting the default build order in an individual game, the hotkey to save a production queue as the default is Shift-Q (source). Then tap Q in a city to load that default production queue.
If you mean setting the default build queue for a scenario, I'm not aware of a way to do that - it seems the scenarios I've played usually have every city building the exact same thing at the beginning. If there's a way to do this, the place where people would know about this is http://forums.civfanatics.com/forumdisplay.php?f=46
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