Expanding universe?

If some galaxies are moving toward each other(Andromeda and Milky Way)
within local groups and some clusters of groups move toward each other and
collide(as shown in Hubble deepest shots), then I presume that all super
clusters must be going away from each other. If not, at what point is the
universe expanding on a galactic scale? Or, do individual galaxies and
groups fly in various directions but mostly away from a center? Thank you
for your responses.