New to 3D and Tinkercad. Trying to modify a model...easiest explanation is to stack a cube on top of a cube....I cannot do it by nudging any axis.... the nudges are either too much or to little. I have also tried chopping any overhand using the hole method...tedious again trying to line it up to cover the overhang..but not dig into the "other" cube! Is there any easier way ? Pulling the handles to resize...again does not allow edge to edge start and stop.