Iso cut ?

 From:  Frenchy Pilou (PILOU)
9431.1 
Hello

Does it possible to have an "Iso cut" ?

As sometime Fillets don't work maybe that will fine to have an "Iso cut" :)

here i draw the Iso-line(s) then cut the surface(s) by the Iso-line (s)
then Blend



Problem is what part of Surface to cut ?
so when you click the near left edge that cut the "little part" or something like that...

http://moiscript.weebly.com/uploads/3/9/3/8/3938813/iso_cut.3dm

EDITED: 14 Jul 2019 by PILOU