Bottom-up meshing is not discussed in any of the examples in this guide. When you enter the Mesh module, Abaqus/CAE color codes regions of the model according to the methods it will use to generate a mesh: Green indicates that a region can be meshed using

This video shows abaqus meshing tutorials for beginners.This video gives you how to mesh the 3d part using hexa element.This video also shows how to do partitioning using different methods.