Word 2016 for Windows7

At the moment, my may problem is that I don't know what the proper terminology is, so searches aren't getting me anywhere...

On the title page of our various documents is the version number for the software. I'm also putting the version number in the footer of the section containing the actual documentation. The idea is that id someone prints out the documentation without the title page, they'll still be able to see what version the document covers. What I'd like to do is set the document up so that when the version is updated on the title page, the footer is automatically updated.

1. What is the correct way to describe that?

2. How do I do that?

Thanks in advance,