Drawing set Z = 0.0 problem

Hi all,

I have a problem regarding Z coordinates (elevation) actually the Archt'l. background are created on 3d model so i didn't recognized that the baseplan has a Z value (elevation), so when i make a MEP services on a background all line to be connected are non-coplanar when doing a fillet or trim command, and now my major problem is when i flatten my layout the line or block are not aligned on the Architectural background and the other line are jumpin away to the original position,

is there possible to fix my layout that to arrange the z value to 0.0 or a command that flatten the drawings and blocks by will fix and remain on its position, kindly help me please.

thanks,

Well CADTutor does have FLATTEN.lsp in the AutoLISP Archives. Maybe it will accomplish the task?

Thanks ReMark,