Dimension styles can be stored in a DGN library. A DGN library that contains dimension styles is also known as a "dimension style library."

If the MS_DGNLIBLIST_DIMENSIONSTYLES configuration variable points to the dimension style library, the Dimension Styles dialog displays dimension styles in this dimension style library. You can save and modify local copies of these dimension styles.

In DGN libraries, you should avoid storing two dimension styles with the same name. However, if the MS_DGNLIBLIST_DIMENSIONSTYLES configuration variable points to more than one dimension style library, and they contain dimension styles with the same name, the dimension style in the DGN library that is processed first will appear in the Dimension Styles dialog.

If a dimension style in a DGN library changes, local dimension styles based on the dimension style library are not automatically updated. To update local dimension styles to reflect the changes in the dimension style library, use the Update from Library icon.