[Therion] How to generate a projected elevation along a specific bearing?

[Footleg]

I've tried searching the wiki and Therion book to find an answer to this,
but it does not seem to feature anywhere. Not even in any examples I can
find. I am trying to draw a simple cave with a 20m vertical entrance shaft,
and a couple of chambers down a slope at the bottom. I've drawn an elevation
scrap for one of these chambers and the shaft. But when I generate an
elevation map using this scrap the shaft looks fine, but the chamber wall is
a mess. So I concluded it is not projecting the elevation along the bearing
I would like. The Therion book showed me I can put a bearing on the scrap
type. So I tried elevation 90. Now my shaft is no longer appearing anywhere
near vertical in the elevation PDF and the chamber. Can anyone help me
please?

Screenshot of scrap, and pdfs with default elevation map and elevation 90
settings attached.

Footleg
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