...using a web page-based hyperlink?

First, please accept my apology if I'm posting this question in the wrong
place, but a FrontPage MVP insisted it is a PowerPoint issue. So, here goes:

I have a large presentation that covers several phases of a departmental
methodology. The department has a presence on the company intranet, including
a page that address each phase specifically. Is there a way to leave the
large presentation intact and link to only the slides within it that address
the details of a given phase?

Some questions already under consideration (Please feel free to add your 2
cents):
Do I save the presentation to HTML? If so, do I output it to one file or
multiple files? If one file, how do I tell the hyperlink where in the one
file to look for the content I want to display? If multiple files, how good
of a job does PowerPoint do of enabling content recognition based on HTML
file name?

And, of course overarching the above questions is this question: Is this a
function of the <a href> HTML tag?

Does anyone have any idea? Thanks for your help.