Select the figure. Render: Materials.

MAKE SURE "TEXTURE CHANGES APPLY TO ENTIRE FIGURE" IS NOT CHECKED!!!"

In the Material drop down, select Eyelashes. (I use Vicki, Posette's eyelashes may have a slightly different name.)
In the Transparency Map area (lower right corner), click load.
Navagate to the transparency map and load it.
Set the Min Transparency and Max Transparency to 100%.
Set the Transparency Fall-Off to 0.

My example screen uses a Vicki texture, but the idea is the same.