Cycles with the PrincipledBsdf node is trickier, you need to combine settings with the Alpha and Transmission channels depending on the object's mesh.  This is how you can modulate translucency, although the alternate method is to connect the PrincipleBsdf and TranslucentBsdf nodes with an add node.  If you have the opportunity to broaden your Cycles knowledge, I suggest looking at some YouTube Blender tutorials.  Be aware, not all the Blender nodes exist in Poser, but there are enough to give you a starting point.