I replied to your other thread. Let me clear up a couple things here.
Importing hair as Type: Hair (instead of cloth/accessory) causes the hair to lose its morphs. You can retain hair morphs if you import hair has Cloth or Accessory (and can even then convert it to "Hair" and it will retain the morphs. But this is probably a moot point because hair tends to have so many polys you are going to reduce it and lose those hair morphs anyway. If you want hair to move around in Unity just use the Dynamic Bone asset.
Polygon Reduction, which deletes morphs/blendshapes, is only for Cloth/Accessory/Hair/Gloves/Shoes not
for the body/figure. CC3 to Unity is going to give your character 68 facial blendshapes whether you export as CC3 Base, Game Base, or with Insta LOD—those facial morphs will remain and be unaffected by the reduced polycount of the character. The only problem is with LOD that prevents the teeth from being linked to the Mouth Open blendshapes (looks really bad when they open their mouths).
CC3 & Daz Tricks | CC3 to Unity workflow