Color Gallery - New Button
The New button in the Color Gallery opens the New Named Color dialog box into which the name of a new named color can be entered. Selecting the Create button in this dialog box will then create a new color with the name you give.
If a named color is selected when the New button is pressed, the new named color will be a copy of the selected named color.
Alternatively, you can right-click on the gallery to open the pop-up menu and choose New.