This is a post by Bettina Giemsa on PTC site.
Are you designing a mold? Once your model design is established, why reinvent the wheel? With Creo Parametric you can quickly duplicate your model’s surfaces and combine the reverse surface with parting surfaces to form a mold component.
First, create a quilt surface on the reference part. Then, that surface can be used in your mold assembly. Here’s how: