copy styles from office 2010 word document to another

Solution 1:

I've found that the easiest way to do this within Word is to open the new document (that you want to import the style to).

To do this, first open the Styles Window (Alt+Ctrl+Shift+S), and click on Manage Styles.
At the bottom of the Manage Styles window is Import/Export....
You can then choose another file by closing your normal.dotm file, and using Open File to select file with style(s), then copying the required styles across.

Works for 2013, 2010, 2007. In 2007 the Manage Styles is a small icon in the Styles Window

In pictures:

Solution 2:

The method is as follows:

1. Developer tab.

2. Click Document Template.

3. Click Attach to navigate to the target document or template.

4. Once back in the Templates and Add-ins dialog, click to enable Automatically update document styles.

5. Click OK.

Note: if the Developer tab is missing, choose Office button - Word Options - Popular tab, and click to enable "Show Developer tab in the ribbon".

Source: http://www.wordbanter.com/showthread.php?t=104074

Hope this helps.