Product Centers are used to group one or more Steps for the purposes of resource planning. A Production Center can be a specific machine or individual.
To create a new click Lists --> Profile Lists --> Product Center and click Save & New from the tool bar. Enter a name, weekly capacity and at least one step. A step can only be listed once per Production Center and by default can only be in one Production Center. You can enable a step to be part of more than one Production Center by un-checking the preference in Company > Preferences > Work Orders > Company Preferences.