PPM Pro supports Project-based (formerly "top-down") and Task-based (formerly bottom-up) resource planning modes. You set the mode when you create a project. Once the project is created, the current setting is displayed in the Settings section of the project view. If you need to change the mode after project creation, you do so from the Re-Plan wizard in the Staffing screen.
When you switch from project-based to task-based planning, any allocations you have made on the Staffing screen will be removed. New resource allocations will be automatically created based on the underlying resource assignments to tasks; these allocations will be read only.
When you switch from task-based to project-based planning, you can manage resource allocations from the staffing screen. Once in project mode, you must allocate resources before you can assign task schedules.
The Re-plan dialog appears.

An informational screen describes what happens as a result of the switch.

You will be prompted to create a baseline before executing the planning mode switch. Click the appropriate radio button, then click Re-Plan.
There will be a couple of status messages, then you will see "Project planning switch complete. Click Close".