Hello
Sometimes we don't want to overwrite the entire element, nor creating a new or sophisticated family to manipulate the Line Styles of a few lines.
It's a very common "issue" when we are making details.
Example: a Detail Item of a metal fixationbracket can be placed on a walldetail with or without thermal insulation, but can also be placed partialy into the insulation. I the last case we want to be able to overwrite the hidden part with Linework to hidenlines.