If you mean something like paragraph 10 of a web page, try this:
If your web site is
www.example.com/mypage.html, on the tenth paragraph you would do this:
<p id="thisparagraph">
Some text
</p>
Then, in the anchor of the referring page, you would do this:
<a href="www.example.com/mypage.html#thisparagraph">
Clicking on that link will then jump down to that paragraph of the page.