How to Create Or Modify Reports in Primavera P6

Primavera P6 allows us to create Report pertaining to Activity relationships by using
1) Import and Export tool
2) Report tool
The major difference between the two is that the former one create separate excel file for each Open project, while the former one created single consolidated file for all the selected or open project. In addition a major difference which make the former one more required because it provide both internal and external project links (External Project links are also know as "Inter Project Relationships),
In addition to this, we would learn here how to open multiple project simultaneously and Summarize and Detailed activities in Primavera P6.
By clicking "Cltr-" Primavera summarize the project and similarly by pressing "Ctrl+", it will open all the activities
After extracting the report using "Report tool" and by using FILTER Command in MS Excel one can easily generate the desired report of External links