Fine cutting line

Hello. I need to make thin cuts, but as soon as I want to apply a cutout, the program puts a new point in the spline and the cutout does not work. please tell me how to make a thin cut?

What do you want to create, do you have a reference image ? Sometimes you can create the objects differently if a tool does not work properly.

yes, thank you very much for your answer. I already understood this and make the model in a different way …

You can remove points from a path by dragging a point into an adjacent one.