Hi when you search the knowledge base you will find this article :

https://www.ptc.com/en/support/article/CS251415 that suggests to rely on the Element Tree methodology. Consequently there is no direct function per say. 

It gives away to look into the shipped example from the header file ProDataShareFeat.h.

Also a code sample has been dropped in this article https://www.ptc.com/en/support/article/CS362850 called 

How to create a local reference type copy geometry feature in Creo Parametric through Toolkit