Many PDF Editor support this. I recommend getting a application to do this because it tends to have features that you may need after you combine the multiple PDF into one. For example, you may need to delete some pages, organizing the pages, or adding a new page for a table of content.
But here are two more utilities that will allow you to create multi-page documents from a single file. I know it has to be done in Word, but you can do it in any word processor. There are a couple of zip utilities and other applications that have a feature to combine several files. It's called. You do that by dividing up the content or a section of the file into pages, or you can put the word in the first column and put the line numbers on the second. Then you merge these pages or parts. It's not something I usually do because I don't have a lot of time to make the documents in batches. You can sort by column, or by line, but you can put the whole page or section in one list or one list of page numbers and then use the merge to split the section up into.