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.
...and for including a full page see https://confluence.atlassian.com/doc/include-page-macro-139514.html
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