If all that is known currently is from Scotland and to Australia, then you will use two categories:
[[Category:Emigrants from Scotland]] [[Category:Immigrants to Australia]]
answered 3 hours ago by Steven Harris
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What if you know the FROM, but there's not an existing subcategory and you don't want to risk messing it up the way you did the last time you tried?
Currently, unless I'm misreading it, the only subcategories from Aberdeenshire go to North America (three).
Same deal with Wigtownshire (one).
Same deal with Lanarkshire (three), except this one branches out and includes .. wait for it .. SOUTH America (two).
The impression given is that nobody ever emigrated anywhere else. I have a number of profiles I could add categories to, but there isn't one, so the generic "from Scotland" you posted above is it. Thanks for that, by the way. It reminded me to add it to the profiles I've been working on.
My folk (so far, anyway) all emigrated from those three to Australia, but that's not to say I won't find a few more from different shires. I'm pretty sure a large number of Scots ended up in New Zealand, as well.