Reference Cinema 4D Basic Features Create Menu Deformer object
Function available in CINEMA 4D Prime, Visualize, Broadcast, Studio & BodyPaint 3D

Taper Object

Basic Coord. Object Falloff

Taper Object

This deformer narrows or widens objects towards one end. Drag the orange handle on the deformer’s top surface to control the taper deformation interactively in the viewport

Cube with 5x5x5 segments.
The same cube with a taper deformation.