Click Home
tabAnnotation
panelDimension
Style. Enter dimstyle at the
command prompt.
In the Dimension Style Manager, select
the style you want to change. Click Modify.
In the Modify Dimension Style dialog
box, Primary Units tab, under Linear or Angular Dimensions, select
a unit format and precision value for the primary units.
Under Linear Dimensions, enter any prefix
and suffix for the displayed dimension.