Hi,

I think it is good to have all the steps present in the same
test case instead of linking or pointing elsewhere because
of the reasons below
1:A test case should be self sufficient.Should have all the
details of execution in the test case itself.
2:What if the create user steps change in future and they
are not the same as edit user?
3:What if for some reason the tester of edit user does not
have access to create user cases?
4:When we link one to other we always have dependency and
when one changes we have to be cautious about the other.
5:Can create maintenance problems
So my suggestion is not to have links.
I also have a suggestion about testing if you do not mind.
There is one amazing site which can make your testing easy.
http://www.testersdesk.com/
There is one tool Person Name Generator which can generate
user names which can be quite useful for your automation and
manual testing. There are a whole bunch of other test data
generation,test case design and other useful tools available
for free at one place. Have a look!