Hi anto, it's pretty difficult to replicate MatchSrf in this kind of manual way.

It tends to be easier to use Blend to do the whole job of generating the in between surface, I guess I'm not sure right now why you don't want to do it that way?

I guess the easiest way to get the same thing that Blend would do would be to make a blend and look at the blend surface's control points and snap on to those points if needed. If you need to get the shape at a particular spot use Construct > Curve > Iso to extract an isoparm of the blend surface at a particular spot and then look at that curve's control points.

- Michael