I'm not familiar with that particular product, but let me wrack the brain
cells from my serious amateur film days of about 30 years ago.
That kind of bellows is used mostly for close-up work. It's also used for
duping slides and negatives if it has a holder that can be attached to the
end that can hold a slide or a neg.
You cannot use it to change a 50 mm lens into a 100 mm lens, for example, as
far as I can recall. It doesn't work as a teleconverter.
Another thing to remember is that as you increase the distance between your
lens and your focal plane, you are dimming the image on the focal plane
(where the rubber meets the road, photographically speaking). Therefore, you
will need good lighting on the thing you're photographing close up (or a
flash).
A bellows for a 35mm camera has some limited pan and tilt functions, but
probably not as much as a view camera. I could be wrong about that.
Since the purpose of this bellows is to enhance close-up photography, you
can't use it like a view camera, say to take pictures of a building.

However......   And this is just a guess on my part. It might be possible if
you have the bellows set at its SHORTEST extenstion, you might be able to
use it kind of like a view camera. Since the lens  would be as close to the
focal plane as the bellows will allow, your picture will be brighter than
when the bellows is extended, and the lens's close-up capabilities will be
at their weakest.  I don't know for sure. Like I said, that was just a
guess.

I'm sure more knowledgeable folk will chime in.

Try here Scott.

The PB6 is really just a long extension tube with a few advantages.

http://www.nikonians.org/html/resources/nikon_articles/other/close-up_macro/macr
o_8a.html

As the last post said bellows on 35mm are just expandable extension
tubes. Most are rigid, Nikon had a bellows with some movement I believe
it was the PB3. Even at minimum extension you do not have infinity
focus with standard lenses. Some folks have used enlarging lenses on
bellows so they have infinity, but with out movements what's the point?

Where bellows really help is extreme closeups, I have done up to 20X
mag with special lenses on a 35mm camera with bellows. The other thing
a good set of bellows has is rack focusing for the closeups. If you
want to do extreme macro then you want a bellows.

Tom