Load the anonymised Topsoil practice DXF and fit the view.
Turn on Shot order to see whether the dotted draft follows the likely base/toe.
Use Select or Lasso to gather all points needed for the next role before pressing a role button.
For obvious rogue/outlying points, gather them with Select or Lasso, then press Delete selected and Fit.
For quick XY checks, press Area, then click up to 10 snapped or free vertices. DXF units are assumed to be metres.
Use Dist for a temporary tape check, or Dim to leave labelled distance lines on the drawing.
For internal points, gather the full group then press PSL, TB, or L in the top-right role toolbar. For a selected base string, gather every required edge point before pressing BB.
When the remaining dotted draft is the base, clear any selection and press BB in the top-right role toolbar.
Use Join pts or Delete line for small BB repairs, then export EC CSV.
Substock:
Substock-style files may already contain BASE/TOP or similar survey codes.
Use Code Map or Grab first when the codes are readable; that keeps known base/toe points as BB.
Shrink-wrap is hybrid: known BB/base/toe codes take priority; if no usable base-coded set exists, it falls back to an approximate outer hull.
Check the CSV preview before export. If the result looks wrong, press Clear all and use the manual route.
Full:
Use Full as the large mixed-survey practice file.
Try Delete within on unwanted swathes, then press Fit to prove the working copy has really reduced.
Build a Surface TIN for profile checks after trimming to the area you actually want to inspect.
Formation:
Use Formation as a secondary linework/text practice file for viewer confidence.
If it does not help the Earth-Calc route, keep it as optional familiarisation rather than a core volume example.
Thin dotted orange = shot-order draft. Solid orange = confirmed BB. Warning: shrink-wrap can reclassify candidate points. It now protects known BB/base/toe-coded points when there are enough of them, but approximate exports still need visual checking.