Create points with Z, intersecting one 2D line and one 3D line

[GTGTOPO]

Hi everybody

I have two layers of points (in a shape of a line) more or less parallel and more or less each 5m, Those points have a  Z field,

I would like to create ortholines exactly between two points of the layer A. those ortholines will intersect a line created thanks to the point of the layer B, that means a Zline.

What I would like is to create automatically points with Z by intersecting this Z line and the ortholines. I have arround 9000 pts to create with this.

the B should be create with the B points, and I would like to create the C points with elevation by intersecting the ortholines in the midlle of the A points