changing coordinates of an existing drawing

hello everybody!

i would like to know if anyone could help me to the following problem..

i have a drawing at AutoCad and i want to change its coordinate like that

X'= X

Y'= -Z

Z'= Y

i know how to do it with the points (export their coordinates in a txt and then transform the txt and then import again at an Autocad)

BUT thus i loose all the line, arcs, etc information

i hope i explained well what i mean and i am not confusing you!!

thanks a lot

well i have a txt file with all the points of my drawing and i can change them, thus i will have all the points at the correct coordinates but there going to be only points and i want to be saved all my drawing (with its lines) - if it is what you you meant!!

thank you a lot for your reply!i hape you could give me an idea cause i m really orrelative!!

Have you tried the command rotate3d?

Select everything. then rotate about the X axis at 0,0,0 by 90 degrees, and the coordinates change as you want them to be, i.e. X=X, Y=-Z, and Z=Y

thank you sooooo much!! i couldn t expect such a quick reply and solucion!!