Originally Posted by
Superman
You need to select a "Surfacing" operation
- drive surfaces ( suggest you create a surface from solid,( will make selecting easier) ) of the bottom feature
- check surfaces ( would be the top face of the part, but only if needed )
- containment boundary ( will be an entity chain around the upper, inside edge of the pocket ), tool needs to be set to stay inside boundary.
- tool diameter needs to be same or smaller than the inside corner fillets on the walls ( can be ball-nose or bull-nose cutter)
NOTE-- you will be left with a radius on the wall to base surface intersection
By selecting too many items to check can create more problems, start off by using the minimum info & only add to it, to control any strange toolpaths
ie --- the walls need only be selected if tapered, the containment boundary would stop the path intruding into the wall.