Can we create SAS internal ID's(example:test@saspw) on SAS Viya via SAS Environment Manager? We can create them via SMC so similarly do have any feasibility on SAS Viya?
There are no SAS internal users anymore in SAS Viya (with the exception of sasboot user). You have to connect your SAS Viya to an external LDAP server.
SAS® Viya® 3.5 for Linux: Deployment Guide -> LDAP Requirements
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.