Navdeep,
If you mean creating new users in the QMC, that is not recommended but possible, and it is done using the System > Setup > DSC > Custom Users.
Once thing is license assignment, which is what people is helping you above, and another different thing is to actually grant access to QlikView to a user that does not exist in your active directory or whatever other security directory you are using.
Put in different words, with the exception mentioned above for custom users, your user must exist in AD, LDAP or your corporate security directory.
Miguel
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