I have tried alot and finally i manged to create cname record in dns to refere to website in IIS but there is somthing i could not solve it:
the forwad zone name is x.y.z
my domin is : mydomianh
CNAME record created in mydomain for the web url "A"
now the web url is accessed with A.mydomain.x.y.Z which is very long.
how i can access the web site A with mydomain.X.Y.Z/A