You can't do it using Find and Replace—unless numbering was created with styles, in which case you can replace one style with another.
If this is direct numbering formatting, make use of Select All X Instances as follows: In the Styles pane (Ctrl+Alt+Shift+S), click the Options link. In the Style Pane Options dialog box, select "Bullet and numbering formatting" under "Select formatting
to show as styles," and click OK. Locate the number format you are using in the Styles pane, right-click and choose Select All X Instances. Then apply the new format to the selection.
Stefan Blom, Microsoft Word MVP
