In Poser hair grows on the poly's of the scullcap. You can modify the scullcap.

Use the group editor, spawn a new prop, to adapt the scullcap if you want/need to.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!