How to Create a Matrix Report in Salesforce
A matrix report summarizes information by both rows and columns.
Next you need to add the fields you want to use as your row and column headings.
Salesforce groups the report by the rows you chose in the report.
The report summarizes the information by both the rows and columns you specified.
Finally, you can specify any fields you want to calculate.
A matrix report is created from the fields you specified.