After you apply an object style, you can override any of its settings. If you decide you like the changes you made to a particular object, you can redefine the style so that it matches the formatting of the object you changed. Be aware that the Redefine Object Style command redefines only categories that are turned on or turned off, but not categories that are ignored. If the object includes additional settings, you’ll need to add those settings separately to the style, or simply create a new object style.
The object style definition changes to match the override settings you applied. All occurrences of the object style in the document are updated to use the new settings.