See my comment under your question about the ineffectiveness of the feature.
When you want to reuse common clauses in several “synthetic” (or rather “synthesised”) documents, the most efficient way is master and sub-documents: the master only includes a link to the sub-documents, not their text, and this allows to always have up-to-date content after refreshing the master.
The second method is Insert>Text from File which copies the content of the designated file into the current document. This means the content is frozen to the state it had at time of copy.
Depending on your needs, one of the methods may be preferred over the other. E.g., when writing a contract, the clauses should not change, should you modify the samples which become applicable only for future contracts. In this case, the Insert>Text from File should be used.
And “about the author” part can be better handled with a link, i.e. a sub-document of a master. There is fundamentally no difference between a master and an ordinary document, save for the possibility to link to sub-docs.
The Insert>Hyperlink is just what it says: it creates an hyperlink to allow navigation to the target and does not copy the target URL or document.
Note: unless you used word section a meaning “part of a document”, don’t use sections in Writer if you don’t need to change temporarily the number of columns or the background for a part of a page. Sections complicate document structure and break text flow (e.g. a keep with next paragraph does not work across a section boundary).
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