Hi there
A bookmark is known as a "Named Anchor" in the world of HTML.
Basically it offers a place to link to inside a topic. So the
general process is to insert the bookmark, then construct an index
term that links to the bookmark.
See Also is a bit more involved. Essentially you define one
or more See Also keywords, then link one or more topics to the
keyword. You then insert a See Also control that points to the
keyword. When the end user clicks the trigger for the control, the
list of topics associated with the See Also keyword(s) is
presented.
Sorry, but you are losing me when you say "Reference Links".
I'm unfamiliar with that particular term.
Cheers... Rick