Using AutoUpdate
From Apache OpenOffice Wiki
Using AutoUpdate
On the Organizer page of the Paragraph Style dialog box there's a checkbox labeled AutoUpdate (Figure 19). It is intended for paragraph and frame styles only. If this checkbox is selected, then AOO will apply, to the style itself, any modification made manually to a paragraph formatted with that style.
| If you are in the habit of manually overriding styles in your document, be sure that AutoUpdate is not enabled, or you will suddenly find whole sections of your document reformatting unexpectedly. |