Units conversion in CAD programs

Good morning,

Does any one out there know if it is possible in a CAD program, AutoCAD
2000, IntelliCAD, Vector etc to change the dimensioning units from mm to
inches or inches to mm. What I want to be able to do is take a drawing in
mm, select the entire drawing and automatically change the dimensioning to
inches. Is there a utility that will do this or something I am missing in
the CAD programs I have that will let me do this?

Thanks in advance

John Guenther
'Ye Olde Pen Maker'
Sterling, Virginia