Project has a resource leveling feature that will attempt to resolve resource overallocations for you. The sidebars on the previous four pages talk about the dialog that controls the resource leveling feature. This feature attempts to reduce the Assignment units for any given resource for a single time period so that it is lower than or equal to that resource's Max Units value. This section covers the tasks that go into using this feature.
Using Project's Resource Leveling Feature
Choose Tools, Level Resources.
Select your leveling threshold.
Select your timeframe (the whole project or a timeframe).
Select your leveling order.
Click Level Now.
Clear Leveling Values from Your Schedule
If you will be clearing the leveling on only some of the tasks in your project, select each of them.
Click Tools, Level Resources.
Click the Clear Leveling button.
Select Entire Project to clear the leveling from every task in the project.
Select Selected Tasks to clear leveling only from those tasks that are currently selected.
Click OK to clear the leveling.
Click Cancel to stop before you clear any leveling.
Choose Tools, Level Resources. 
Select your leveling threshold. 
Select your timeframe (the whole project or a timeframe). 
Select your leveling order. 
Click Level Now. 
Click OK to clear the leveling. 
Click Cancel to stop before you clear any leveling. 
