This video shows a way to make what I want:
It starts from a big outline of capital letter T and a bunch of parallel lines:
The T is used only as a reference where to insert new nodes to the parallel lines. Every new node is inserted manually with the "Add Anchor Point"-tool. A part of the new nodes are dragged manually upwards and this shape is formed:
Adding points manually is not a big deal if the wanted result is this simple- only about 60 clicks. But it's a heck of work if the wanted pattern is something more complex than a simple letter.
I want to insert automatically new nodes to the parallel lines to every point where the reference curves (=T) and the lines cross. I need just the insertion of the nodes, not moving them. I move the nodes manually as the artwork needs.
NOTHING should be splitted to pieces, only new nodes should be inserted. Reference curves would be used as a guides when the generated nodes are moved manually. If the reference curves vanish, it's OK because I can paste them back to place or have a locked spare copy. But no splinters are wanted.
How to do it?
My own efforts:
I have tried to use Pathfinder operations to divide the parallel lines at the crossings, but it's not useful. Both the parallel lines and the reference curves are splitted to pieces or combined in an 100% useless way. I have not found any practical method to rejoin the pieces. Doing it manually and removing the pieces of the reference curves one by one is at least 200% more difficult than inserting the new nodes manually.