So qux has data for bar@baz?
No. Qux is a separate part of the cave for which I have only centreline data. bar@baz is a map for a part where I have complete data, and I have drawn all the scraps.
I generally have one piece of centerline per scrap and include only the centerline data when there’s no scrap.
Yep, that's how I would do it. By way of demo, I have attached a simple file. This is *not* how I actually arrange my data files, this is just a demo, so you can see that the data is arranged into 2 subsurveys. One of those subsurveys has scraps, the other has only centreline. I want my PDF to show the scraps from the "mainpart" subsurvey but *not* the centreline/stations within it, and I want it to show the centreline for secondpart, since it has no scraps, and I have only a centreline to show.