You probably know how to use the mailto command for quickly linking to one email address. You can not only link an email address but a subject line as well.
Just highlight the text you want to put mailto link on and click on the hyperlink icon,
In the pop-up window, type in the correct text.
The link text should be:
- Use the usual mailto:
- Then enter an email address,
- After that add ?subject= and then follows the subject line that you chose.
- Between every word use %20 as a spacing between the words.
Learn more about Mailto options here.