You can use the Style and Standard Editor to create, edit, or purge styles. New or edited styles are saved in the standard style of the current document, unless you specifically select Manage tab Styles and Standards panel
Save.
You create a style by copying an existing style and modifying it to suit your requirements.
On the ribbon, click Manage tab Styles and Standards panel
Styles Editor to open the dialog box.
In the style list browser, click to expand a style type, and then select a style you want to use as the basis of the new style.
Right-click the style, and then select New Style or click New.
Click OK. The new style is listed in the style type browser.
You can edit a style in your current document, but it does not affect other documents.
If you know there are styles in your document that you do not intend to use, you can purge the unwanted styles.
You can purge styles two ways:
On the ribbon, click Manage tab Styles and Standards panel
Purge.
In the Purge Styles dialog box, unused styles are listed.
Click column headers to sort contents as needed. In the Purge column, unused styles are automatically labeled Yes but you can click individual styles to switch to No.
Click Yes to All or No to All to reset individual settings and mark all styles at once.
Select the Purge Sub-Styles check box to remove unused substyles with a parent style. Clear the check box to retain substyles when a parent style is purged.
Select the Purge Styles from all Child Documents check box to purge unused styles from the current document and all referenced documents. Not available for part documents.
sClick OK to purge styles or Cancel to close the dialog box without purging.
You can use Undo to recover styles purged from the current document.