Filter Out Activities Whose Resources are over allocated

in p6 create a new code for overallocation

go to view show on bottom resource usage profile

and look at the time frame where the overallocation is occuring and the look for those activitie that are occuring in the time frame of the overallocation

give each of the activites that are occuring during the overallocation time frame the new code that you just made

now filter on that new code