The Units dialog allows you to specify two different units. No matter what setting you choose, or how many times you change this during the design process, this will not affect the underlying data. All values in Easy-PC are stored to 1/10th Micron precision so there are no rounding errors.
Use the Units dialog on the Settings menu to change the units, and to alter the precision (number of decimal places) for displaying coordinates and lengths.
You can also double-click on the unit name shown on the status bar to toggle between the pair of units defined on this dialog.