[Therion] Two extended profiles for same survey

[Tarquin Wilton-Jones]

> Full description on the wiki https://therion.speleo.sk/wiki/extend
> The second option that Tarquin describes is set out towards the bottom of that page.

Pretty sure the answer is "no", but...

Can you do this in a thconfig:

source "cave.th"
source "extend1.th"

where cave.th contains the cave survey data, and extend1.th contains the
"extend" commands?

I would imagine that to do it, you would need to re-enter the original
survey, which is not permitted.