Hello Friends
Some of the Max users face this problem that is they make their drawing in mm units in Autocad and in 3ds Max they intend to work in feet and inches. What they have to do is simply Rescale it in mm only not in inches from the Import dialog box in 3ds Max. Some users change the Rescale to feet and inches; which will make the drawing 25.4% larger than actual..So Rescale in mm only.
After importing you can set the system units to Feet w/fractional inches and My system unit setup is also set to inches.