Ok, so after a lot of searching, reading manuals all I’ve come up with is this (and it’s far from ideal) — if a contour is broken, you can still embolden it without merging occuring to that particular contour, and anything that overlaps it. The result isn’t exactly the same as a normal bold transformation, as in normal circumstances at a point of intersection, there needs to be a node that sits on a unit. Makes sense. Now is there a way of doing this that does makes sense..!