I am a little doubtful if you will be able to utilize the Autoschedule functionality that comes with PPM Gantt, as you will not be using ETC for the tasks or the projects.
As you see, this Autoschedule uses task duration, task date constraints, priority order, dependency information, and related date and resource logic to identify the project critical path and schedules tasks. Each task is scheduled:
- To use availability as early in the project as possible
- To start at the earliest or latest possible time, subject to date constraints
- To minimize the duration of the critical path.
The critical path determines the earliest finish date of the project. Autoschedule uses the critical path information to make the following scheduling adjustments:
- Determines early and late start and finish dates for each task.
- Moves the early start forward or back, as applicable.
- Checks for load patterns that are set to fixed, and adjusts early start and finish dates to fit.
- Builds new ETC curves that are based on the recalculated early start and finish dates for the tasks, and subtracts as applicable from remaining resource availability.
- To eliminate or minimize resource over-allocation, calculations can move out a task finish date, or the project finish date.
Hope this helps. Thanks.