I've written a few tutorials on this in the past... I went and did some Google and Duck Duck Go Fu to see if I can find them for you. Hopefully these help.

https://steemit.com/daz3d/@dwinblood/daz-3d-studio-genesis-3-to-unity-pbr-setup-blender-for-ao-maps-graz-zt-how-to-get-a-character-into-unity-and-set-it-up-with-full

https://steemit.com/unity/@dwinblood/daz-studio-and-unity-getting-morphs-from-daz-studio-into-unity-in-a-fashion-that-is-useable-basic

Some of those steps (The Blender steps) are not required unless you want Ambient Occlusion maps and such that Daz doesn't include. You can get Normal, Spec, and Diffuse without needing to do the blender stuff. Blender in that tutorial was just used to generate some AO textures as well.

https://steemit.com/unity/@dwinblood/daz3d-genesis-3-to-unity-the-problem-with-eyes-making-the-imported-daz-eyes-look-nice

https://steemit.com/unity/@dwinblood/daz-studio-unity-simple-lod-experimentations-in-optimizing-the-crazy-daz-studio-hair-polygon-count-so-it-is-not-as-bad-for-game

The next one is an improvement to my PBR post...

https://steemit.com/daz3d/@dwinblood/update-improvement-to-daz-3d-daz-studio-genesis-3-to-unity-pbr-setup