In manufacturing, it is often required to estimate uncut material shape between cutting stages in milling cycles. This may be useful to avoid undesired results like tool breakage, nonoptimized cutting time, and inferior surface finish besides other factors like improper feed-rate, large over-thickness, and inability of handling complex geometries. Current work discusses some strategy of ReSt (remaining stock) machining concept in CNC practices where machined and unmachined geometries are progressively computed and stored through different stages like roughing, semi-finishing, and finishing operations. The modeling of ReSt geometry in these stages is discussed with various possibilities in the parametric regime. The proposed algorithms are discussed with simulation results.