Typical inhomogeneities to be evolved in this scale level are the deformation-induced structures, normally yielding lamellar or band-like morphologies accompanied by relatively large “misorientation” across the bands or the walls. Since the “misorientation” is introduced so as for the grain of interest to accommodate the imposed geometrical constraint from its surroundings, these substructures are roughly categorized in “geometrically-necessary” types of bands (GNBs), in contrast to the dislocation cells in Scale A (being “mechanically-necessary”), which mediates the other two scales, therefore, may be expressed as “absorber.” Also, the chapter discusses the inhomogeneity evolutions in Scale B based on FE-based simulations, which incorporates the incompatibility-tensor field model in its constitutive framework. Starting from showing preliminary simulation results, some advanced outcomes are presented, including modeling of metallurgical microstructures (e.g., martensite lath block and packet) as a further extension.