hi Waldo,im not sure what you mean but amapi has Dynamic Symmetry Modeling,i think that is what you want to know(take a look at the product tour for amapi7 on the eovia site). i make my models in amapi7(soon in amapi pro,woohoo) and make some additional modeling in zbrush(when needed).i really like to use the spline modeler in carrara and i really dont like to use the vertex modeler very often.