[Therion] Offsets with shadow or outline also shown

[John Stevens]

I have been trying to show an offset of a lower passage with the outline of the higher passage also shown on the offset.

So the main plan shows the high level in detail with the grey shadow of the lower passage. I would like the offset to show the detail of the lower passage with the outline of the higher passage.
To do this I tried the following map structure. 

map keyhole1LLM #lower level map
  keyhole1ps3
  break
  keyhole1ps5
  break
  keyhole1ps4
  keyhole1ps7
  break
  keyhole1ps6
  keyhole1ps8
endmap
map keyhole1HLM # high level map
  keyhole1ps1
  break
  keyhole1ps2
endmap

map keyhole1M # combined map – not used
  keyhole1HLM
  break
  keyhole1LLM
endmap

map keyhole1LLpreHLM  # lower shown, higher outline
  keyhole1LLM
  preview above keyhole1HLM 
endmap

map keyhole1Moffset # higher shown, lower grey - offset only lower shown ???
  keyhole1HLM
  keyhole1LLpreHLM [-10 50 m] below
endmap

The map keyhole1LLpreHLM shows what I want to offset with the detail of the lower passage and the higher in outline.
But when this is offset the higher outline vanishes! 
Is the preview command the way to go about this or is it not possible at present?

John S
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