Post-Pick Containerization is when containerization is done by the system after the Picking process. To set up a containerization as post-pick, you need to select ‘Use System Containerization’ field, and the ‘While packing, upon request’ option in ‘Containerization is performed’ field in the ‘Settings for Pack after Pick Process’ in the Pack Planning window.
Pre-Pick Containerization is when containerization is done by the system before the Picking process. Pre-Pick Containerization is done when the ‘Pack while Pick’ and the ‘Use System Containerization’ fields are checked in the Task Type Wizard, while configuring the Task Type.
For more information configuring the task type, see "Defining Task Types".