For slides that you don't want to have shown in the
navigation/outline tab of a published deck, simply set their status
to hidden while in PowerPoint.
Just be aware that once you have hidden slides, as you move
from the Chapter slide to the "regular content" slides, you'll
loose the highlighting that normally occurs in the nav panel. To
help in terms of usability issues, what you might want to consider
is including "chapter/page" information directly on the content
slides so that viewers will have some sense of where they are in
Example: Slide 1 is a Chapter slide. It's not hidden so it'll
show up in the nav. Slide 2-9, although set to "hide" in
PowerPoint, also have a text box somewhere on the slide that says
something like "Chapter 1: XXXXXXX / pg 2"