Interim plans are like mini-baselines. They store ONLY the start and finish dates of the tasks as they were at the time the interim plan was saved. These can be used in addition to the full baselines to save the state of the start and finish dates of tasks at various points in time. There are 10 interim plans.
Saving an Interim Plan
Click the Tools, Tracking, Save Baseline menu item.
Select Save Interim Plan.
Select Start/Finish from the Copy field.
Select the appropriate Interim plan that you want to save.
Choose whether the interim plan should be saved for the entire project of just the selected tasks.