1 add edge
add one more edge, so your opening has 32 edges.
_selEdgeRing
_insertEdge
2 initial bridge
build an initial bridge 12x6 faces.
_bridge
and delete the selected faces / loops.
after deleting you need
_removeCrease
the result is similar to what @martinsiegrist meant with “rectangular SubD Plane”. (but with this approach you already get closer to the shape.
3 final bridge
now bridge the entire opening
4 File
shoeLast_01_tp_rh7.3dm (517.4 KB)