What is the purpose of Custom Colors?
To access a palette dialog box containing a range of colors that you can use or customize. You can also save the customized color, which is then automatically added to the palette in place of the original color. This color palette is accessible from the dialog boxes that display when working with line, region, symbol, and text objects.
How do I access Custom Colors?
On the PRO tab, click Options, and click Custom Colors to open the Define Custom Colors dialog box.