First of all, my condolences to you for using anything by Veritas these days. Second, as Mike says, CBT is enabled by default and there's nothing you need to do. That said, you must ensure any VM is at virtual hardware level 7 or greater. The VMware Consolidated Backup user is just a role that has the needed permissions to back up VMs. This isn't mandatory you use this exact role, just something that has equivalent permissions.