I've yet to mirror anything in the hair room. The closest I've gotten was once I was working on a hair group that spanned the whole head and when I selected strands on one side I accidently selectd them on the other too so I only did half the work. But that won't help you. If you grew the hair on a prop and have p10 or pp2014, you might be able to copy that  and use the fitting tools on the morph brush to make that prop fit the other arm but otherwise, I think you'll need to do it from scratch. There aren't many shortcuts for the hair room yet.

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