Now we switch to resource leveling. If your project does not have any over-allocated resources, create a hypothetical scenario by over-allocating resource(s) in MS Project. For example, you can select a few resources and force each of them to have their respective total allocations above 100% (say by assigning resource Tom 70% to activity A and 50% to a parallel activity D). Resolve the over-allocation using the features that MS Project has for accomplishing this