You can add, delete, rename, and copy plot styles
in a named plot style table using the Plot Style Table Editor.
The Plot Style
Table Editor is also used to change plot style settings for both
named and color-dependent plot style tables.
delete or edit the NORMAL plot style. Also, you cannot add, delete,
copy, or rename plot styles in a named plot style table if a color
mapping table has been attached to the plot style table. A color
mapping table associates every plot style with an ACI color.