I have a loft using 14 spline sketch sections each on its own plane.  Each spline point is driven by an external database along with the spacing of the planes.  Sections 3 and 4 are not working well and need to be replaced.  I cannot change the values from the database (proprietary), but I need to tweak the loft.  The surface has other features built on it, so I cannot delete the surface and recreate it.

I want to create a couple new spline sketches on planes 3 and 4 with relationships to the original sketch.

Next, I want to have the same loft use my new sketches in place of the original sketchs -  I won't be deleting the original sketches.

Is it possible to create new sketch sections then replace them in the existing loft?

If not, is there another way to fix it?

Thank you,

Todd