Annotate tab > Dimensions group > 
(Define dimension overrides) menu > Define dimension overrides, DIMOVERRIDE
Annotate tab > Dimensions group > (Define dimension overrides) menu > Create overrides
Annotate tab > Dimensions group > (Define dimension overrides) menu > Attach overrides
Annotate tab > Dimensions group > (Define dimension overrides) menu > Read overrides
Annotate tab > Dimensions group > (Define dimension overrides) menu > Delete overrides
With dimension overrides you can deviate from the dimension style, i.e. define settings to a single dimension object that differ from the settings defined in the style. Or, as the name implies, you will override the corresponding setting defined in the dimension style.
Overrides are used when you want to make small changes on the settings of one or a few dimension objects without creating a separate dimension style for them. A typical example would be defining tolerances for some dimension objects. Different dimension objects might have different tolerances, so defining a separate dimension style for each one would too laborious.
There are several different ways to define dimension overrides.
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Modifying dimension objects by double-clicking them.
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Define the dimension settings with the DIMSETTINGS command. All new dimension objects will then assume the new settings as overrides. Define dimension overrides in the same way as in dimension style settings.
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Enter ' as input when drawing a dimension. This will open a list of dimension-related system variables. Select a variable and enter a desired value. The defined dimension override will only apply to the dimension object that is currently being drawn.
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Select Annotate tab > Dimensions group >
(Define dimension overrides) menu > Define dimension overrides.
Attach overrides to selected dimension objects.
Read the overrides from selected dimension. These overrides can then be attached to other dimension objects.
Remove overrides from selected objects. All selected dimension objects will be generated according to their dimension styles.