The Transformation Tab will not change stuff that's already in your drawing. If they had given you this request BEFORE you did your design, then it would have been relatively easy to setup the Transformation Tab for it, and then do your design on ground.
One of the most important guidelines of design is to decide on your coordinate system BEFORE starting ANY work on a project, and then keep that coordinate system throughout, from beginning to end. As it is, you have a problem.
You can try scaling everything using the Autocad SCALE command, and depending on what all is in your DWG file, it might actually work. Let us know...
(Of course, the BEST solution is to keep it in State Plane the way you have it, but I know what sort of battle
that can be...)
-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc