> 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.
encoding utf-8

survey smalldrop -title "Small drop"

        map everything
                allscraps@mainpart
                secondpart
        endmap

        survey mainpart -entrance 4
                input smalldrop.th2
                map allscraps
                        surface
                        break
                        scrap7
                        scrap6
                        scrap5
                        scrap4
                        scrap3
                        scrap2
                        scrap1
                endmap

                centreline

                        extend start 8

                        fix 1 1234 1234 10
                        1       2       10 0 1.91021317
                        2       3       10 0 1.91021317
                        3       4       10 0 1.91021317
                        4       5       10 0 1.91021317
                        5       6       10 0 1.91021317
                        6       7       10 0 1.91021317
                        flags surface
                        7 8 10 180 11.536959
                        flags not surface

                endcentreline

        endsurvey

        survey secondpart

                centreline

                        1       2       30 270 -30

                endcentreline

        endsurvey

        centreline
                equate 1@mainpart 1@secondpart
        endcentreline

endsurvey
encoding  utf-8
##XTHERION## xth_me_area_adjust -161.0 -129.0 402.75 1525.6280000000002
##XTHERION## xth_me_area_zoom_to 400
##XTHERION## xth_me_image_insert {118.11 1 1.0} {118.106 1} smalldrop.xvi 0 {}



scrap scrap1 -projection plan -scale [19.75 39.25 216.5 236.25 0.0 0.0 10 10 m]

line wall
  70.0 257.0
  82.0 204.0 11.22 112.21 118.11 118.106
  160.38 120.44 149.0 193.0 170.0 236.0
  smooth off
endline

point 118.11 118.106 station -name 1

endscrap



scrap scrap2 -projection plan -scale [19.75 39.25 216.5 236.25 0.0 0.0 10 10 m]

line wall
  59.0 429.0
  125.1 305.06 42.0 328.0 70.0 257.0
  smooth off
endline

line wall
  170.0 236.0
  205.0 327.0 191.0 381.0 170.0 425.0
  smooth off
endline

point 118.11 314.76599999999996 station -name 2

endscrap



scrap scrap3 -projection plan -scale [19.75 39.25 216.5 236.25 0.0 0.0 10 10 m]

line wall
  -32.0 622.0
  -33.0 553.0 103.0 543.0 101.0 511.0
  99.0 479.0 6.0 506.0 59.0 429.0
  smooth off
endline

line wall
  170.0 425.0
  135.0 462.0 125.0 479.0 126.0 511.0
  127.0 543.0 269.0 537.0 266.0 603.0
  smooth off
endline

point 118.11 511.616 station -name 3

endscrap



scrap scrap4 -projection plan -scale [19.75 39.25 216.5 236.25 0.0 0.0 10 10 m]

line wall
  -26.0 722.0
  16.0 715.0 -33.0 656.0 -32.0 622.0
  smooth off
endline

line wall
  108.0 851.0
  108.0 807.0 53.0 777.0 -26.0 739.0
  smooth off
endline

line wall
  266.0 603.0
  270.0 650.0 283.0 793.0 262.0 820.0
  smooth off
endline

point 118.11 708.266 station -name 4

endscrap



scrap scrap5 -projection plan -scale [19.75 39.25 216.5 236.25 0.0 0.0 10 10 m]

line wall
  105.0 986.0
  108.0 919.0 105.73 875.22 108.0 851.0
  smooth off
endline

line wall
  262.0 820.0
  243.0 848.0 131.0 918.0 130.0 991.0
  smooth off
endline

point 118.11 905.116 station -name 5

endscrap



scrap scrap6 -projection plan -scale [19.75 39.25 216.5 236.25 0.0 0.0 10 10 m]

line wall
  98.0 1203.0
  103.0 1111.0 111.0 1122.0 109.0 1079.0
  107.0 1036.0 103.0 1031.0 105.0 986.0
  smooth off
endline

line wall
  130.0 991.0
  128.0 1052.0 137.0 1054.0 139.0 1097.0
  141.0 1140.0 126.0 1160.0 126.0 1200.0
  smooth off
endline

point 118.11 1101.776 station -name 6

endscrap



scrap scrap7 -projection plan -scale [19.75 39.25 216.5 236.25 0.0 0.0 10 10 m]

line wall
  83.0 1299.0
  103.0 1277.0 101.0 1252.0 98.0 1203.0
  smooth off
endline

line wall
  126.0 1200.0
  128.0 1242.0 114.0 1291.0 138.0 1299.0
  smooth off
endline

point 118.11 1298.626 station -name 7

endscrap



scrap surface -projection plan -scale [19.75 39.25 216.5 236.25 0.0 0.0 10 10 m]

line slope -close on
  130.0 1137.5
  orientation 181.9
  l-size 7.5
  95.5 1138.25 77.75 1130.25 82.5 1105.0
  87.25 1079.75 113.75 1063.5 130.5 1066.5
  147.25 1069.5 154.5 1087.25 155.25 1102.0
  156.0 1116.75 164.5 1136.75 130.0 1137.5
endline

point 118.11 1105.676 station -name 8

endscrap


encoding  utf-8
layout local
  color map-fg altitude
  symbol-hide group centreline
endlayout
source "smalldrop.th"
select everything@smalldrop
#export map -proj plan -o "smalldrop2.xvi"
export map -proj plan -layout local -o "smalldrop.pdf"
export model -fmt survex -o "smalldrop.3d"
set XVIgrids {1.0 m}
set XVIstations {
  {        0.00      -590.22 1}
  {        0.00      -393.48 2}
  {        0.00      -196.74 3}
  {        0.00         0.00 4}
  {        0.00       196.74 5}
  {        0.00       393.48 6}
  {        0.00       590.22 7}
  {        0.00       397.35 8}
}
set XVIshots {
  {        0.00      -590.22         0.00      -393.48}
  {        0.00      -393.48         0.00      -196.74}
  {        0.00      -196.74         0.00         0.00}
  {        0.00         0.00         0.00       196.74}
  {        0.00       196.74         0.00       393.48}
  {        0.00       393.48         0.00       590.22}
  {        0.00       590.22         0.00       397.35}
}
set XVIgrid  {-118.11 -708.333 19.685 0.0 0.0 19.685 13 72}
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