Rerun a report with the same Parameters
To rerun a Report with the same parameters as previously used, click on the “Rerun” Report button from the Report button strip. 

Merge two reports together
Preview both of the reports you want to merge. Click on the ‘Export Report Data’ icon to export the report and once both have been exported, click on the ‘Merge Queries’ icon. 
You can choose to merge the reports horizontally, which will keep all the rows from both reports, or vertically, which keeps all the columns from both reports. 
You also need to select which field to use to merge these reports, the dropdown menu will provide options of which fields you can choose from. 

Report Toolbar
The report toolbar automatically appears when you preview the report. It allows you to perform a variety of additional functions and quickly navigate your way around the report.