You can segregate AM and PM jobs (or any other pre-defined time slots you may have), with the Sync Time feature. The Sync Time feature works like this: if you set the sync time for all your PM slots to be shown at 11 am, then only at 11 am will your driver be able to see the jobs to be delivered for your PM slots. Using the Sync Time feature, you can automate the release of jobs to your drivers in batches according to your defined timings.
You can set the sync time by first, enabling the field on your dashboard, Settings > Job Settings > Sync Time (check this field).
Next, you can input the Sync time manually for each job if you are manually entering the jobs or you can also create an extra column in your excel to import the Sync Time information.