if useradd command is deleted in solaris how do we add user
As root, vi the /etc/shadow and /etc/passwd file.
Add a new line of entry for the new user.
And create and chown a home directory for the account.
If you are going to use the route guessed by "incredible" seriously consider using "vipw" (not "vi") and follow-up with "pwconv". You will still have to create the user home directory accurately from the contents of /etc/skel.
The whole approach is dubious and repairing the command from a release kit is preferable.