Welcome!

As of writing this, only official Daz3d.com vendors can make hair in other software and convert to SBH.

Nevertheless, we are able to create SBH within Daz Studio itself using the SBH Editor. See tutorial below:

https://www.deviantart.com/uncannyvalet ... -957594505

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Thank you so much for this in depth, super useful tutorial.
https://3dshards.com/create-sbh-daz/