Creates a new units file and activates the Existing File to Start From list and New Units File Name box. After you have completed both items, click View > Edit File. The software displays the Units File Maintenance dialog box, in which you can edit your units and conversion factor entries.
If the user-defined units for a given item exist in the list, then it is not necessary
to specify a conversion factor, as it is updated automatically. If a new set of units
is required, such as, for example, feet (instead of inches) in the Length category, either select the new unit name (ft.) in the User Units list and select the new conversion factor in the Constant list or type a new factor in the text box.