How do I link fields in different sections?

I have a Word template which has 3 sections:

-Frontpage
-Main content
-Annex

When I want to fill in information like date, name, order number etc. in the header, and I want those information to be on all pages, I'd have to repeat it 3 times - once for each section.

Is there a way to link fields in between sections, so when I fill in a text in one field, the other fields in the other sections which are linked together fills in the same text simultaneously?

Best Regards

Arash