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Check out for getcell command... Say for suppose u need 2 instantiate a 2bit fulladder. First u need 2 draw & save a 2bit fulladder with all ports.. Then using getcell command u can instantiate tht saved fulladder as many times u want. when u instantiate u need to label all the ports with a new name. One thing to be noted while using getcell command is that on instantiating u wont be able 2 edit anythin in the instantiated one.
(without using getcell) --> While if u save fulladder & load that fulladder into current layout u can do modifications if u need.. Hope this answered ur query