How grant designer access to multiple users.

This can be accomplished by creating new system users, or assigning permissions to Employees requiring access.

When the product was implemented, system users, in addition to viadmin should have been configured.  Was this not done?

I suggest to refer to the documentation for your version: https://support.oneidentity.com/technical-documents/identity-manager/8.1.1/authorization-and-authentication-guide/15#TOPIC-1250060.

Also, be very careful this user is not locked out!

Trevor