Every Word document has an attached template, even if it is just the default one for a blank document. If you want to use a different template after working on your document, you can attach a different one to it. BUT... you only get the styles, not any graphics that are a part of the new template.
Word 2007 and 2010:
- Office button or File tab > Word Options
- Add-Ins
At the bottom of the right pane, in the Manage text box, select Templates.
Click the Go button. - In the Templates and Add-Ins dialog, click the Attach... button and browse to select a template that is on your computer.
Check the box 'Automatically update styles'. - Click Open and then OK.
Word 2013, 2016:
- Right click on the ribbon in choose Customize ribbon.
On the right, check the box Developer to show that tab on the ribbon.
Click on OK.- Click the button Document Template
.
Click the Attach... button and browse to select a template.
Check the box 'Automatically update styles.' - Click on OK.