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I can't seem to find rules for outflank anywhere, assuming there are actually specific rules, and it isn't just talked about on here as a simple tactical manoeuvre.
(I guessed not because in 40k it'd be difficult to outflank, considering bases are round and you don't have anything like the rules for turning in WHFB, also it seems to always have a capital letter when it does crop up)
p. 94 under Outflank.
What it does is to give certain units the ability to arrive from one of the two "short" sides instead from the long table edge when deployed from Reserves