How to insert a pages document into another pages document?

Open your files & show thumbnails. Sections have a yellow border around all of the pages in that section. Now click on the page in the thumbnail pane & copy. If the file is more than one page & you only want one, you'll need to insert a section break to separate the pages. Then go to your other file, click in the thumbnail pane & paste. The whole copied page will be pasted in. Repeat with another section. Styles will copy over with the sections but headers & footers will not.