Transfer Ortho Elevation data to Plan views

[Morphim]

Hello.

Firstly, I'm referring to building plans here

In simple terms (if possible) how is orthographic elevation data (ie. front, side, rear views) transfered to plan views in Autocad. (ie. what's the general method?)

I have elevation views of the outside of my house (proposed building extension)

What is the usual method for transferring this information to a plan layout. I'm specifically referring to the room layout in roof space.
This is mainly for an extension of sloped roofspace and I need to plot the layout of the rooms within.

I'm able to create a 'top' view (ie in theroy, looking straight down on the roof, as if from outside; where the slopes lie and locations of gullies and hips, but I'm having trouble working out the internal layout.

I'm sorry if this isn't particularly clear Can anyone decipher what I'm on about??

[lpseifert]

Maybe this thread will help...
http://www.cadtutor.net/forum/showthread.php?t=17787