For the excerpt macro see https://confluence.atlassian.com/doc/excerpt-macro-148062.html
To reuse the content see https://confluence.atlassian.com/doc/excerpt-include-macro-148067.html
The Excerpt Include macro is used to display 'excerpted' (that is, a segment of) content from one page in another.
Before you can use this macro, the excerpt must have been defined using the Excerpt macro. Note that you can have more than one Excerpt Include macro on a page (although you can have only one Excerpt macro on a page).
...and for including a full page see https://confluence.atlassian.com/doc/include-page-macro-139514.html
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