Create default category for job

public class CustomJobManager extends DefaultJobManager {
    public CustomJobManager(JobServiceConfiguration jobServiceConfiguration) {

    protected void fillDefaultAsyncJobInfo(JobEntity jobEntity, boolean exclusive) {
        super.fillDefaultAsyncJobInfo(jobEntity, exclusive);

I have this extended class from DefaultJobManager and overried method fillDefaultAsyncJobInfo does this mean every job I have created will have “myCustomJobCategory” ? I have two engine using the same database and I want each engine will be execute their own job. One more question is why there are no method such as select job to execute by tenant id ?
My thanks to you guys