How do I combine comments in Acrobat Pro DC?

Thanks so much for your reply, I finally figured out how to do it. It is very frustrating that Adobe took a tool that was once very easy to use (and a 1 step process) and tuned it into a 2 step process therefore doubling the amount of work I need to do. I have 9000 pages that I received from a client. I have 2 different editors reviewing each page at the same time (they each have their own copy of the file). Once they are submitted back to me I need to combine the comments for each page. It was already going to be an arduous task, now it just got doubly arduous.

If you know of a simpler way to do this, I would be grateful to hear it.

My process is, I receive single page PDFs (approx 300 at a time) from my client. We have two different editorial tasks to do. I post the all of the PDF to an FTP site for one editor to do their job and another FTP site for the other editor to do their task. They both then post the files back to me, and I am to combine the comments.