Customized Report

On my project,I want to prepare a  report for monthly distributed count for Engineering Work Packages(EWPs).One EWP is represented by one activity. Total count is the activity count planned for each project calendar month during the length of project.For each month, I have cut off date which is last friday of month i.e. it is not a calendar month.

How can we get an activity count for project month(NOT CALENDAR MONTH) & distibute it for each month for project duration???

 

Any suggestion,how I can do it????