If you need a tool that can help you add page numbers according to the combination of pages of PDF files, then use the Sysinfo PDF Bates Numberer Tool. The tool adds Bates numbers to any number of PDF files simultaneously. The tool provides you with multiple formatting options to sequentially number pages with a reference number. The tool allows previewing Bates on the Output PDF file before the final results. Some of the tool's other features are: 

• You get multiple formatting options to sequence Bates numbers.
• Add Confidential text and current timestamp to the PDF pages.
• Customize Bates Number to encrypted/password-protected PDFs.
• Compatible and effective tool will all versions of Windows OS.