How do I keep the Header on an inserted page

[Sue]

I need to insert different page into a document, but would like to keep the
header from the insert document on each page

 

[Charles Kenyon]

This involves being aware of sections and section marks.
http://word.mvps.org/FAQs/Formatting/WorkWithSections.htm
http://addbalance.com/usersguide/sections.htm