Acceptable values include None and "1" through "9". Style definitions with menu command keys also generally include a to determine the location of the style in the Format ► Style submenu.
This option is typically specified in the style definition cell of a stylesheet.
Create a style definition for the cell style "MyTitle" that can be accessed by choosing Format ► Style ► MyTitle or pressing Alt+1 and reformat the cell:
Create a style definition for the cell style "MyTitle" that can be accessed by choosing Format ► Style ► MyTitle or pressing Alt+1 and reformat the cell: