Converting 3D dwg to 2D dwg

[VFR750]

I need to change a 3D autocad r2000 dwg file into a 2D drg in ucs plan world view.
Drawing has been produced with various ucs and elevation settings which need to be converted to zero elevation and zero thickness. Some ucs appear to have been deleted from the drawing.
I have used the command CHANGE to try and alter properties but get messages 'no parallel to ucs' and 'cannot alter elevation of objects with differing Z values'which ever ucs I use. I have tried the changeprop dialogue box with no sucess and tried converting to dxf and re importing to no avail. .....any suggestions

 

[exit]

Hi,

take this thread555-3656

Win NT4.0 (SP6),
ACAD 2000i (SP2), ADT 3.0 (SP3),
ACAD 2002, ADT 3.3,
OCÈ 5200