Try this :
- Load your character with zero pose......then deselect it.
- Load your hair, select it, and in the scene tab, edit--->scene identification...
- When a window appears, choose "Genesis 3 Female" (Prefered base) if your character is a genesis 3 female...then accept.
- You can then play with the axes XYZ (Hair) for a good looking.
- After this, drag and drop your hair in the Head of your character in the scene tab.
- You will then apply a pose and the hair will follow
Tell me if it works !!
Sorry for my english, i believe you understand me.