I know InstaLOD is used to reduce polygons of any character. But sometimes instead of decreasing we need to increase polygons of a character. I have tried my level best to find out how to increase polygons in CC3, but failed. So I tried ZBrush for it. Even when we transfer a character through GoZ and increase its polygons there, it automatically decreases polygons as it were before.
My suggestion is that please in next version of CC add a feature to increase the number of polygons.