All Orders provides a report called the 'capacity report'. The capacity reports adds all the budgeted hours for all steps in all work orders within the specified due date grouped by Production Center. The sum of those hours will be deducted from the Production Center's capacity to arrive at 'Available Hours'.
In order to use the capacity report you need to set up one or more production centers.
Once you have set up your production centers and have a least one work order, you can run the capacity report from Reports > Work Orders. By default the Capacity Report will filtered for work orders that are due in the current month. You can change the filter to view capacity for a different period.