ISSUE: Automated task to modify users via template

We have started a new program on site where past users are coming back into our system. I created a template to update their AD account with settings for Active Users and move them to a new OU. When I run the template with Modify Bulk Users using the same CSV I use in the automation task, I get to select the search criteria and the update criteria. However in the automation process I do not have this option resulting in what appears to be a user lookup by last name. This is problematic as its changing the incorrect users. Is there a way to set the lookup criteria to something like sAMAccountName or EmployeeID?