I’m assuming you mean the Principle BSDF in Blender 4.0. It’s no longer 2 separate inputs. The roughness input is used for both diffuse and transmission roughness. Setting the transmission weight to 1 activates the clear(Glass) material. You will want to adjust the IOR too. Glasses are usually between 1.5-1.53. Windows are usually 1.51-1.52. I use 1.503 for windows and 1.523 for cups.
