Answer
You can use the Foxit PDF Editor's virtual printer called Foxit PDF Editor Printer to print multiple pages of a PDF file into one PDF page. Here's how you can do it:
1.Open the PDF file in Foxit PDF Editor that contains the pages you want to merge into one single page.
2.Click on File > Print to open the Foxit PDF Editor Print window. In this window, select "Foxit PDF Editor Printer" as the printer.
3. In the Foxit print dialog box, select "Multiple Pages per Sheet".
4. In the "Pages" field, input the page numbers you want to merge, separated by commas. Then click the OK button to merge the selected pages into one new PDF page. The following figure illustrates how you can combine page 1, page 2, page 3, and page 4 into one PDF page.