is there a way to create users simultanously in 10 servers.
It is probably possible to do it simultaneously but it would be much easier to do it sequentially.
You could pretty easily write a simple script to do it.
You might want to take a look at Ansible
Central identity management (FreeIPA, OpenLDAP, etc.) or, if you don’t use any of those systems, some script that will SSH into servers and use
It would be useful for the next person with this problem, if you told us how you solved it.