Yes, you can reattach a template over and over again. First, you must show the Developer Tab in the ribbon because the template controls are located on that tab. To show it, follow these steps:
1. Click the Office Button.
2. Click Word Options.
3. Under Popular, select Show Developer Tab in the Ribbon.
Click the Developer Tab and look around! There are lots of handy controls on that tab.
To select a new template or reattach the same template, do the following:
1. In the Ribbon in the Template Group, click Document Template. The Templates and Add-Ins dialog box opens.
2. Select the Templates tab.
3. Click Attach.
4. Select a template from the list, or browse to the template you want to use.
5. Click Open.
6. (Optional) Select Automatically Update Document Styles.
7. Click OK.
Now your template is reattached and your styles updated. You can do this over and over again with any of your documents.
This is handy if you have many documents that use the same template, then you change the actual template file and need to update the styles in your other documents.