Yes it is, Dutch. Go to the 3D preview mode, and depending on the type of building, modular or independent, various combinations of SHIFT/ALT, CTRL/ALT, etc., will change the facades, and by cycling through those, you'll eventually get to destroyed walls and then completely razed buildings. I believe it's a simple left click with the mouse to cycle through the independent buildings, and the ALT combos for the modular ones. Sorry, I'm going from memory here...but it's covered in the manual.
Edit: Page 143 of the original CMBN Manual.
MODULAR BUILDINGS
For each side and each floor of each building the texture, number of doors, and
number of windows can be set. If the wall is exposed it can have a balcony of
one sort or another. The type of roof can be changed as well, provided that
alternative roofs are available for the building.
One of the more interesting, and powerful, features is the ability to completely
remove walls by toggling through the “window/door layouts†until the wall
disappears. This allows adjacent buildings to be combined into larger struc-
tures, such as a massive warehouse or L shaped house. Since individual
walls on individual floors can be removed, it is possible to have a building
complex that is open on some levels and closed on others, or 3 stories in one
section and only 2 in another section. The tactical possibilities created by
this feature should not be overlooked!
In general, each of the following clicks and key+click combinations toggles
through the available options for each building in succession.
SINGLE WALL
CTRL-CLICK on a side changes window/door layout for wall
CTRL-SHIFT-CLICK on a side adds balconies for that wall
Note: for upper levels without balconies, door configurations
are skipped except when the camera view is inside the
building. This makes it easier to set up “interior†walls
between immediately adjacent buildings.
SINGLE SIDE
CTRL-SHIFT-CLICK on ground floor adds balconies to all floors on that
side
ENTIRE BUILDING
ALT-CLICK changes window/door frames for all four sides
SHIFT-CLICK changes the buildings texture for all four sides
CTRL-CLICK on roof changes shape/type of roof (if available)
ALT-CTRL-CLICK changes the windows/door layout for all floors on the
same side of a building
ALT-SHIFT-CLICK cycles through stages of major damage to building,
starting at a blown-out roof, progressing through blown-out upper levels, to
complete rubbling.
INDEPENDENT BUILDINGS
Individual buildings largely work like modular buildings, with a few notable
differences: the window and door layouts are fixed and cannot be changed,
and no balconies can be added. The following key+click combos apply to In-
dependent Buildings:
CTRL-CLICK on a side/roof changes cycles through stages of pre-battle
damage for floor/roof
SHIFT-CLICK changes the buildings texture for all four sides
144
Combat Mission
ALT-CTRL-CLICK cycles through stages of major damage to building,
starting at a blown-out roof, progressing through blown-out upper levels, to
complete rubbling.