We have 3 groups of resources in a department - journeyman, apprentice and master. We need ASCP to s

We  have 3 groups of resources in a department - journeyman, apprentice and  master. We need ASCP to schedule the apprentice first on the jobs. Then if there are jobs still left to work, then schedule the journeyman. Then if more jobs are still available, then schedule the master. How do I get the system to schedule the resources in that order? We are on 12.2.4 using ASCP.