The bookmark in Word allows you to jump to a specific place on a page that you defined.
In HTML use we call these page anchors, and it is how the Table of Contents on a profile are created here on WikiTree.
So you can use this to your benefit. For example, if you have a header:
=== My Bookmark ===
You can then link to that specific section, from the same page, using:
[[#My_Bookmark|See this Section]]
If you want to link to that specific section from another page, you just include the page name, such as:
[[Harris-5439#Digital_Afterlife|Steve's Digital Afterlife Declaration]]
Which gives you this: Steve's Digital Afterlife Declaration