Can you please take a look at the attached file?
I am trying to trim the surface I've created through extension (surface-extend3) using the three planes I've created (planes 5,6,7). For some reason I was able trim using plane 6, but the other planes do not trim the extended surface. The reason is explained to be that they do not intersect, but I think that is not the case.
I've also tried using the other offset surfaces to be the trimming planes for the extended surface but that did not work either.