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Geometric tolerancing shows deviations of form, profile, orientation, location, and runout of a feature. You add geometric tolerances in feature control frames. These frames contain all the tolerance information for a single dimension.
You can copy, move, erase, scale, and rotate feature control frames. You can snap to them using the object snap modes. You can use DDEDIT to edit feature control frames, or you can edit them with grips.

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Dimension line arrowheads are AutoCAD blocks. (See chapter 13, “Using Blocks and External References.”) AutoCAD provides 19 arrowheads that you can use, but you can also create and use your own arrowhead blocks. AutoCAD inserts the block in the arrowhead location and sets the object’s X and Y scale factors to arrowhead size × overall scale. To trim the dimension line, AutoCAD inserts the rightmost block with a zero rotation angle for horizontal dimensions and rotates the leftmost block 180 degrees about its insertion point. If you use paper space scaling, AutoCAD computes the scale factor before applying it to the arrowhead size value.

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You can do anything with dimension style overrides that you can do with the dimension style. Use it as a base for a new style, or modify, rename, delete, or compare the overrides to other styles. You cannot set the overrides current because they are already current. If you set another style current, your overrides are discarded. However, you can rename them to a new style, or save the settings to the current style.

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You can define dimension style overrides for individual dimensions, or for the current dimension style. For individual dimensions, you may want to create overrides to suppress a dimension’s extension lines or modify text and arrowhead placement so that they do not overlap drawing geometry without creating a different dimension style.
You can also set up overrides to the current dimension style. All dimensions you create in the style include the overrides until you delete the overrides, save the overrides to a new style, or set another style current.

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AutoCAD assigns a style to all dimensions. The style assigned is the one set current in the Dimension Style Manager. STANDARD is the default style. If you create dimensions in one style and later want to assign a different style, you apply a dimension style to the dimensions.

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