just to clarify a few points for you, hope it helps.
there are three shapes in the cockpits folder, cockpit.gp4,cockpit_dash.gp4 and cockpit_wheel.gp4.
the cockpit.gp4 is a redundent file, i have deleted it from my cars.wad.
However the cockpit shape is a combination of the dasboard and the wheel.
by default the steering wheel shape cannot be edited in z-modeller, but the dash and cockpit can be.
from som info in this forum i was able to remove the steering wheel for the cockpit shape and save it as cockpit_wheel.gp4 which was now editable and works in gp4. the default sash shape is editable however in z-modeller it appears as a mess. yoll either have to leave it unedited or rearrange things as you like, youre welcome to use any of my shapes as a starting point. perhaps look at vipers dash shape, i think hes left it pretty much as default, only adding a window.
as for moving objects from 1 to the other i simply moved the whole object name and all. i did this by loading the default wheel, deleting whatever i didnt need and then merging what was left with the dash shape. (i'd already edited the dash and saved in z-modeller format)
if these are any use to you you are very welcome
heres a default wheel shape and my dash shape in z3d format, plus a couple of extra .tgas youll need to load them properly
[urlhttp://www.users.bigpond.com/Caelen/cockpits/zmodshape.zip[/url]