Yes, almost! It seems to choose all lines between all points when I do what you showed on the image.
Basically I am trying to create a vertical plane which moves around the curve and grows in height as the cylinder in the centre of the curve. Like on the attached sketch.
I thought that I can start with finding points on curve and selecting two next to each other. Then moving them up to create a surface. And then move the points higher around the curve to extend that surface. Surface is to act like a window observing the cylider when it gets taller.
IMG_2098.HEIC.pdf (11.5 MB)