Create superuser in slackware? Help me
 

How to a superuser in slackware
UID, GroupID superuser in slackware ?

There should only be one "superuser", root. To have multiple user accounts with root-level privileges defeats the purpose of having the root account in the first place.

If you need another user account to have higher privileges, then you would want to look into using sudo to allow specific commands to be run with root privileges. But you definitely don't want to give any other account full access to the system.

This begs for a standard question: What problem are you trying to solve? Give us the big picture---i.e. the context for your question.