Adding a crawl space afterwards

[Parnell]

Hi! Thanks for this great program!
I am trying to add a crawl space after I have designed the other levels (my mistake). So I added a new level with some walls, set elevation to 0 and added the height of the crawl space as elevation value to the other levels (3 levels). All elements, furniture etc. are now correctly elevated but the walls are not elevated. The walls of the ground floor are e.g. still on the ground (and therefore obscuring the crawl space). They should be on top of the crawl space. I have done houses with basements before (negative elevation) but then I have always started with the lowest level. Now I am trying to add it afterwards. What am I doing wrong?

[Puybaret]

The height of a wall placed in a level is actually the height you set in its modification dialog box + the floor thickness of the level. May reduce the floor thickness or elevate the level above the crawl space a little more.