Any style ”whether it was supplied by Excel or created by you or someone else ”can be modified. Suppose you created a style containing fonts and colors your company uses. If those specifications changed, you could modify the style to include the new attributes. If you want to use styles created or modified in another workbook, you can merge the styles into the open workbook. If you no longer use a style, you can delete it from the workbook.
Modify a Style
Delete a Style