There are three steps:
In Excel or other spreadsheet, create a file with the following column headings:
Ensure that Color is spelt the American way! Save as ColourBookTemplate.xls in a suitable location.
Open the template file, save as <meaningful_name>.csv, e.g. Pantone Greys.csv; Project Spaces.csv, or similar. This file name is the one that will appear in the drop down list of Colour Books.
Enter each colour name and RGB values, some examples are shown below.
Warm Gray 1 C
Create an empty 3D dgn file, save as <meaningful_name>.dgnlib, e.g. <project number>ColourBook.dgnlib. Ensure that this file does not contain any levels, shared cells or any other graphic elements.
The location of this file will vary according to the system configuration and version:
CONNECT Edition:For use by all users it should be located in ...\Organization\Dgnlib\For use by a project it should be located in the Workset ...\Standards\Dgnlib\
V8i:For use by all users it should be located in ...\workspace\standards\dgnlibs\For use by a project it should be located in that project’s dgnlib or resources folder in accordance with local CAD standards. (The project configuration file, if used, may need amendment to apply the new file location.)
The variable MS_COLORBOOK_LIBRARIES defines the paths where Color Books will be found, check that the locations defined include the locations of your custom Color Books.
Go to File > Settings > Color Books... > File > Import > browse to <meaningful_name>.csv.
Each dgnlib can contain one or more colour books. If importing more than one colour book the first file to be imported will be at the head of the list. There is no way to rearrange this list without deleting and re-importing so, if the list order is important, plan it in advance.
It may help management if each dgnlib only contains one colour book, you then know exactly what is in each dgnlib. Prefix each dgnlib name with a number to control the sort order if alphabetical is unsuitable.