The supported report formats by Nessus allow a user to present the report in multiple ways. If the user wants to store the scan results in a secure manner, they can use the DB format, which is encrypted. If the user wants to share the report directly, they can use the HTML format of the report. For further analysis, they can use the CSV format to import the report results into tools or software. If the user requires to share scan results with other administrators, they can use the .nessus format, where the administrator can import the file into their own Nessus and perform further analysis.
For a CSV report, if there are multiple CSV reports and a user requires to merge all the reports in Windows, they can open Command Prompt from the folder where all the CSV files are located and use the copy *.csv <name of the new file>.csv command, thereby obtaining a merged CSV single file. Further filtering and removal of duplicates with sorting allows you to create a linear report.