Curious...
Our sun and other stars in the spiral arm we are in, (Orion's Arm),
alternately pass through other spiral arms and inter arm regions . So my
question is, do regions where stars form in, like the Orion Nebula, move
in the same way as the sun?

If the stars are dynamic in position over time, does this mean Orion's
belt and stars like Theta, at the heart of Orion, will someday be part
of another arm within our galaxy?

In the Universe there are motions within motions within motions -- more
localized motions matter in this case. Due to perturbations by other
masses (stars, gas clouds, dark matter (maybe), the local motion of a
given body will likely be less regular than its larger motions
(rotation with the rest of the stars of the Galaxy, movement of the
Galaxy itself within the Local Group, and on up the hierarchy.) The
constellations are ephemeral; Orion has looked the way it does today
for a very long time, but in the distant past a hypothetical observer
on Earth would have seen it differently; indeed, if the observer lived
long enough he would have seen Orion taking shape. This goes for the
future, as well; Orion (and the rest of the sky) will look pretty much
the same for a very long time, but not forever. If our observer
continues his very long life he will see Orion break up.

A few millennia will be enough to notice that some stars are moving,
even without special instruments. That's how the first star was
detected to have a proper motion: the star Arcturus was noticed to be
situated one or two degrees differently relative to the background
stars a few centuries ago, compared to the time of the ancient Greeks.