Creo Simulate > Modeling Structure and Thermal Problems > Properties > Shell Properties > About the Shell Properties Dialog Box
  
About the Shell Properties Dialog Box
Click Refine Model and then click the arrow next to Shell. Click Shell Properties to open the Shell Properties dialog box. You can also access this dialog box by clicking More on the Shell Definition dialog box after you have selected Type as Advanced. You use this dialog box to do the following:
Create new shell properties in your model.
Edit, duplicate, or delete existing shell properties.
Move shell properties into or out of the library using the right and left arrows.
When you click New to create a new shell property, the Shell Property Definition dialog box appears.