1) When the model as a whole is a central cavity mold and mold are higher than the outer contour of the boss, you need to highlight the part of the upper parts processing in accordance with the entity, can clearly see the lower part of the outer contour of the cavity mold processing method.
2) When the contour shape of the convex parts for processing, you may want to cut out processed parts, it should be a two-step process to complete the contour shape. Step in the upper part of the process, another step (final step) for the remainder of 4-2 mm high processing so that the parts cut down.
3) For the stepped portion of the flange part, the contour shape can be used processing methods flange. At this point the best knife with a flat processing, and use of internal node edit delete redundant paths, so as to leave the path of machining the flange