The MAT poses only apply the different textures/color schemes (Wizard White, Dwarven Red, etc.). The Sample poses (like BeardStyle_Wizard1) mostly manipulate the parameter dials.

To adjust the length, select the Beard figure, choose Head from the Body Parts list, and start playing with the parameter dials.

Beard and hair length are governed mainly by the dials Wizard1Wavy and Wizard1. The balding look is handled by the dials BaldFront2 and BaldFront (see illustration), not transmaps; the hair is pulled into the head, not made transparent.

On the other hand, if you want to use just the hair, or just the beard, you make the unwanted part transparent by turning off its transmap and setting the transparency sliders to maximum.