nI would create a plane, just slightly inside the end (a known trim amount). Sketch a rectangle on that plane that is slightly larger than the section. When you return to 3D mode, you will have a planar surface. Now use either the Split Body button with the Target being the new surface and the tool being the two faces, with the option checked to Keep Cutter. You should be able to split the planar face into two pieces. Delete the outside face.nDo Split Body to trim the two wing surfaces to the new plane, delete the small pieces at the end.nUse Combine and the + option to Unite all the surfaces into one solid body. If successful, you can use the Pull tool to recover the known trim amount.n