Project in one direction only, is this possible?

Hi, I want to project a curve onto one side of a brep but I cannot prevent it projecting onto the opposite side as well.
I’ve managed to create a cull pattern so I can reduce the output list to only positive values but the output list is only numbers. I need to turn those numbers back into some geometry to project onto and I don’t know how to do it.
Any advice welcome, many thanks
Will

File?

Hi
Why you don’t use " cull index " to have a list of faces to project or not?

This is a possibility.

Fantastic, thank you for taking the time, it worked perfectly!