Getting rid of OLD stations and groups

Are non-existent workgroups and workstations deleteable or
do you have to wait until they decide to just fade away
one day??

I've moved all workstations out of a group into another
group about 4 days ago and the workgroup still shows up
in "Entire Network". So I now see the newly created group
with all the stations that I put in ALONG with the group
that has been emptied. But the old workgroup is not
accessable, which totally makes sense since there is
nothing in there. Is there a way to delete groups and
stations once they have been so-called removed from the
network?? THANX N ADVANCE Wayne B.