This manual describes how to use the 'selection models' of the Open3DModel to create 'sub models'. Sub models are 3D models of the Open3DModel that contain only a limited number of structures and are aimed to view or demonstrate a specific anatomical topic, e.g. what is the spatial interrelation of structures a, b and c. They are meant to allow easily viewing or demonstrating of a specific (anatomical) topic. The sub models are collected at https://anatomytool.org/open3dmodel-learn.