convert NATURAL KEYS in my LDM into SURROGATE KEYS when I generate my PDM?

PowerDesigner 16.5

My logical data model (LDM) contains only natural keys (NKs).  All of my LDM relationships reference NKs.  When generating my physical data model (PDM), I wand a surrogate key added to every TABLE and I want all of the NK relationships to be replaced with FK relationships based on the newly generated surrogate keys.  What is best practice for implementing this?